Cull extraneous whitespace.

One last flurry with the broom before I leave you slobs to code
in your own filth. Eliminated all the trailing whitespace I
could manage, with special prejudice reserved for the test cases
which depended on the preservation of trailing whitespace.

Was reminded I cannot figure out how to eliminate the trailing
space on the "scala> " prompt in repl transcripts. At least
reduced the number of such empty prompts by trimming transcript
code on the way in.

Routed ConsoleReporter's "printMessage" through a trailing
whitespace stripping method which might help futureproof
against the future of whitespace diseases. Deleted the up-to-40
lines of trailing whitespace found in various library files.

It seems like only yesterday we performed whitespace surgery
on the whole repo. Clearly it doesn't stick very well. I suggest
it would work better to enforce a few requirements on the way in.

1 files changed, 2 insertions, 2 deletions

diff --git a/test/files/pos/t262.scala b/test/files/pos/t262.scala
index b81490977c..ec6187b36b 100644
--- a/test/files/pos/t262.scala
+++ b/test/files/pos/t262.scala
@@ -1,11 +1,11 @@
 object O {
   abstract class A {
-    def f:A; 
+    def f:A;
   }
   class B extends A {
     def f = if(1 == 2) new C else new D;
   }
-  class C extends A { 
+  class C extends A {
     def f = this;
   }
   class D extends A {