Calypso: Warn when compiling dangerous methods

[jecisc]

Today I blew up an image with an intern because we added a #name method in the class side, which messed up with everything asking for the name of the class concerned.

Calypso should warn about that when compiling some methods such as #name on the class side, or #isNil or #class on instance or class side. (The list should be bigger but here are some examples)

Refactorings also need to be aware of those so we should put the list somewhere for both Calypso and Refactorings to refer to.