SI-10120 ReplReporter handles message indent

Instead of indenting source code to make messages
align on output, let the reporter add indentation,
only if the source is the console (and not a pastie
or a loaded file).

Previously, syntax errors were not indented.

```
$ skala
Welcome to Scala 2.12.2-20170108-010722-939abf1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_111).
Type in expressions for evaluation. Or try :help.

scala> 'abc'
<console>:1: error: unclosed character literal (or use " for string literal "abc")
       'abc'
           ^

scala> :quit
$ scala
Welcome to Scala 2.12.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_111).
Type in expressions for evaluation. Or try :help.

scala> 'abc'
<console>:1: error: unclosed character literal
'abc'
    ^
```

1 files changed, 2 insertions, 2 deletions

diff --git a/test/files/run/t9170.scala b/test/files/run/t9170.scala
index 87471fb129..cb7971235f 100644
--- a/test/files/run/t9170.scala
+++ b/test/files/run/t9170.scala
@@ -48,8 +48,8 @@ object Y {
 def f[A](a: => A): Int at line 12 and
 def f[A](a: => Either[Exception,A]): Int at line 13
 have same type after erasure: (a: Function0)Int
-         def f[A](a: => Either[Exception, A]) = 2
-             ^
+  def f[A](a: => Either[Exception, A]) = 2
+      ^
 
 scala> :quit"""
 }