Maintenance of Predef.

1) Deprecates much of Predef and scala.Console, especially:

 - the read* methods (see below)
 - the set{Out,Err,In} methods (see SI-4793)

2) Removed long-deprecated:

 - Predef#exit
 - Predef#error should have gone, but could not due to sbt

At least the whole source base has now been future-proofed
against the eventual removal of Predef#error.

The low justification for the read* methods should be readily
apparent: they are little used and have no call to be in global
namespace, especially given their weird ad hoc semantics and
unreasonably tempting names such as readBoolean().

3) Segregated the deprecated elements in Predef from the part
which still thrives.

4) Converted all the standard Predef implicits into implicit
classes, value classes where possible:

  - ArrowAssoc, Ensuring, StringFormat, StringAdd, RichException (value)
  - SeqCharSequence, ArrayCharSequence (non-value)

Non-implicit deprecated stubs prop up the names of the
formerly converting methods.

8 files changed, 30 insertions, 15 deletions

diff --git a/test/files/presentation/callcc-interpreter.check b/test/files/presentation/callcc-interpreter.check
index dd3ee68e45..af0154fe60 100644
--- a/test/files/presentation/callcc-interpreter.check
+++ b/test/files/presentation/callcc-interpreter.check
@@ -59,7 +59,8 @@ retrieved 63 members
 [accessible:  true] `type NamecallccInterpreter.Name`
 [accessible:  true] `value __leftOfArrowcallccInterpreter.type`
 [accessible:  true] `value __resultOfEnsuringcallccInterpreter.type`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormatcallccInterpreter.type`
+[accessible:  true] `value __thingToAddcallccInterpreter.type`
 [accessible:  true] `value term0callccInterpreter.App`
 [accessible:  true] `value term1callccInterpreter.App`
 [accessible:  true] `value term2callccInterpreter.Add`
diff --git a/test/files/presentation/ide-bug-1000349.check b/test/files/presentation/ide-bug-1000349.check
index 7eeaddc054..0040300083 100644
--- a/test/files/presentation/ide-bug-1000349.check
+++ b/test/files/presentation/ide-bug-1000349.check
@@ -35,5 +35,6 @@ retrieved 36 members
 [accessible:  true] `method →[B](y: B)(Foo, B)`
 [accessible:  true] `value __leftOfArrowFoo`
 [accessible:  true] `value __resultOfEnsuringFoo`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormatFoo`
+[accessible:  true] `value __thingToAddFoo`
 ================================================================================
diff --git a/test/files/presentation/ide-bug-1000475.check b/test/files/presentation/ide-bug-1000475.check
index 01de4608ca..7866e4af15 100644
--- a/test/files/presentation/ide-bug-1000475.check
+++ b/test/files/presentation/ide-bug-1000475.check
@@ -32,7 +32,8 @@ retrieved 35 members
 [accessible:  true] `method →[B](y: B)(Object, B)`
 [accessible:  true] `value __leftOfArrowObject`
 [accessible:  true] `value __resultOfEnsuringObject`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormatObject`
+[accessible:  true] `value __thingToAddObject`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 ================================================================================
@@ -69,7 +70,8 @@ retrieved 35 members
 [accessible:  true] `method →[B](y: B)(Object, B)`
 [accessible:  true] `value __leftOfArrowObject`
 [accessible:  true] `value __resultOfEnsuringObject`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormatObject`
+[accessible:  true] `value __thingToAddObject`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 ================================================================================
@@ -106,7 +108,8 @@ retrieved 35 members
 [accessible:  true] `method →[B](y: B)(Object, B)`
 [accessible:  true] `value __leftOfArrowObject`
 [accessible:  true] `value __resultOfEnsuringObject`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormatObject`
+[accessible:  true] `value __thingToAddObject`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 ================================================================================
diff --git a/test/files/presentation/ide-bug-1000531.check b/test/files/presentation/ide-bug-1000531.check
index 7fa550179f..18ecd4b536 100644
--- a/test/files/presentation/ide-bug-1000531.check
+++ b/test/files/presentation/ide-bug-1000531.check
@@ -120,7 +120,8 @@ retrieved 124 members
 [accessible:  true] `method →[B](y: B)(java.util.Iterator[B], B)`
 [accessible:  true] `value __leftOfArrowjava.util.Iterator[B]`
 [accessible:  true] `value __resultOfEnsuringjava.util.Iterator[B]`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormatjava.util.Iterator[B]`
+[accessible:  true] `value __thingToAddjava.util.Iterator[B]`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 [accessible: false] `method reversed=> List[B]`
diff --git a/test/files/presentation/implicit-member.check b/test/files/presentation/implicit-member.check
index 7b4f792bf3..6a23facc78 100644
--- a/test/files/presentation/implicit-member.check
+++ b/test/files/presentation/implicit-member.check
@@ -36,6 +36,7 @@ retrieved 38 members
 [accessible:  true] `method →[B](y: B)(Implicit.type, B)`
 [accessible:  true] `value __leftOfArrowImplicit.type`
 [accessible:  true] `value __resultOfEnsuringImplicit.type`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormatImplicit.type`
+[accessible:  true] `value __thingToAddImplicit.type`
 [accessible:  true] `value xImplicit.type`
 ================================================================================
diff --git a/test/files/presentation/ping-pong.check b/test/files/presentation/ping-pong.check
index c85f6cc21a..c7a5d0b5d1 100644
--- a/test/files/presentation/ping-pong.check
+++ b/test/files/presentation/ping-pong.check
@@ -33,8 +33,9 @@ retrieved 39 members
 [accessible:  true] `method →[B](y: B)(Pong, B)`
 [accessible:  true] `value __leftOfArrowPong`
 [accessible:  true] `value __resultOfEnsuringPong`
+[accessible:  true] `value __stringToFormatPong`
+[accessible:  true] `value __thingToAddPong`
 [accessible:  true] `value nameString`
-[accessible:  true] `value selfAny`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 [accessible: false] `value pingPing`
@@ -75,8 +76,9 @@ retrieved 39 members
 [accessible:  true] `method →[B](y: B)(Ping, B)`
 [accessible:  true] `value __leftOfArrowPing`
 [accessible:  true] `value __resultOfEnsuringPing`
+[accessible:  true] `value __stringToFormatPing`
+[accessible:  true] `value __thingToAddPing`
 [accessible:  true] `value pongPong`
-[accessible:  true] `value selfAny`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 ================================================================================
diff --git a/test/files/presentation/t5708.check b/test/files/presentation/t5708.check
index 572f404cf4..4fc7a56426 100644
--- a/test/files/presentation/t5708.check
+++ b/test/files/presentation/t5708.check
@@ -35,8 +35,9 @@ retrieved 43 members
 [accessible:  true] `value CONST_STRINGString("constant")`
 [accessible:  true] `value __leftOfArrowtest.Compat.type`
 [accessible:  true] `value __resultOfEnsuringtest.Compat.type`
+[accessible:  true] `value __stringToFormattest.Compat.type`
+[accessible:  true] `value __thingToAddtest.Compat.type`
 [accessible:  true] `value pkgPrivateVString`
-[accessible:  true] `value selfAny`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 [accessible: false] `method privateM=> String`
diff --git a/test/files/presentation/visibility.check b/test/files/presentation/visibility.check
index 87b4463bf7..e9b349ac06 100644
--- a/test/files/presentation/visibility.check
+++ b/test/files/presentation/visibility.check
@@ -39,7 +39,8 @@ retrieved 41 members
 [accessible:  true] `method →[B](y: B)(accessibility.Foo, B)`
 [accessible:  true] `value __leftOfArrowaccessibility.Foo`
 [accessible:  true] `value __resultOfEnsuringaccessibility.Foo`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormataccessibility.Foo`
+[accessible:  true] `value __thingToAddaccessibility.Foo`
 [accessible: false] `method secretPrivateThis()Unit`
 ================================================================================
 
@@ -83,7 +84,8 @@ retrieved 41 members
 [accessible:  true] `method →[B](y: B)(accessibility.Foo, B)`
 [accessible:  true] `value __leftOfArrowaccessibility.Foo`
 [accessible:  true] `value __resultOfEnsuringaccessibility.Foo`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormataccessibility.Foo`
+[accessible:  true] `value __thingToAddaccessibility.Foo`
 ================================================================================
 
 askTypeCompletion at Completions.scala(22,11)
@@ -125,7 +127,8 @@ retrieved 41 members
 [accessible:  true] `method →[B](y: B)(accessibility.AccessibilityChecks, B)`
 [accessible:  true] `value __leftOfArrowaccessibility.AccessibilityChecks`
 [accessible:  true] `value __resultOfEnsuringaccessibility.AccessibilityChecks`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormataccessibility.AccessibilityChecks`
+[accessible:  true] `value __thingToAddaccessibility.AccessibilityChecks`
 [accessible: false] `method secretPrivate()Unit`
 ================================================================================
 
@@ -164,7 +167,8 @@ retrieved 41 members
 [accessible:  true] `method →[B](y: B)(accessibility.Foo, B)`
 [accessible:  true] `value __leftOfArrowaccessibility.Foo`
 [accessible:  true] `value __resultOfEnsuringaccessibility.Foo`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormataccessibility.Foo`
+[accessible:  true] `value __thingToAddaccessibility.Foo`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 [accessible: false] `method secretPrivate()Unit`
@@ -206,7 +210,8 @@ retrieved 41 members
 [accessible:  true] `method →[B](y: B)(accessibility.Foo, B)`
 [accessible:  true] `value __leftOfArrowaccessibility.Foo`
 [accessible:  true] `value __resultOfEnsuringaccessibility.Foo`
-[accessible:  true] `value selfAny`
+[accessible:  true] `value __stringToFormataccessibility.Foo`
+[accessible:  true] `value __thingToAddaccessibility.Foo`
 [accessible: false] `method clone()Object`
 [accessible: false] `method finalize()Unit`
 [accessible: false] `method secretPrivate()Unit`