188.8.131.52: pretty-printing improvements
* Improved pretty-printing of simple LOOP forms, IF, and
MULTIPLE-VALUE-CALL. Patches by Tobias Rittweiler.
* Improved pretty-printing of general macro calls by inspecting
location of &BODY in the lambda-list. Patch by Tobias Rittweiler.
* Make tests in walker.impure.lisp ignore newlines as well.