Fixed deepToString to put spaces after commas
(like regular Array toString, and List, etc.).
Fixed all the test cases depending on this.
Fixed the interpreter to keep my mind from wandering.
git-svn-id: http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk@16292 5e8d7ff9-d8ef-0310-90f0-a4852d11357a