Duplicate methods and constructors in classes

[Cécile Camillieri]

When adding constructors and destructors we can end up with the same method signature multiple times in a class. Plus when adding/removing parameters in methods it doesn't prevent this problem either. Since adding and removing parameters in methods can take multiple steps, we shouldn't prevent the user from having same signatures at a given point. However we should use the validator and return errors in case such things happen.

[Romain Alexandre]

References #284: Show a validation error when two methods have the same signature.

→ <<cset 52aaa45e566b>>

[Romain Alexandre]

Merged in Issues/284-duplicate-methods-and-constructors-in-classes (pull request #24)

References #284: Show a validation error when two methods have the same signature.

→ <<cset dccafb3a3373>>