[Pharo-project] Stack re-implemented

Hi list, issue 1336 proposes re-implementing Stack using the new LinkedList which can take arbitrary objects. I committed the code and it was really straightforward to do. Now stack is implemented in 3 one-line methods, removing about 10 methods, and removing one class (StackLink). Please see http://code.google.com/p/pharo/issues/detail?id=1336 or SLICE-issue-1336-StackReimplemented-NikoSchwarz.2. in the inbox. Cheers, Niko