[Cuis-dev] [ChangeSet] Updates on refactorings

[Nahuel Garbezza]

Hi!

Attached is a changeset with the following changes (and their corresponding
tests):

[extract temporary / rename temporary]
  - fix error message for instance variable already defined in class
  - allow to perform the refactoring in a debugger

[extract method]
  - extracting to an existing selector (in the current class or any
superclass) now raises a warning
  - allow to perform the refactoring in a debugger
  - improve error messages and validation logic

[documentation]
  - add a comment on RefactoringPrecondition class

Thanks,
Nahuel.
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