Push up #removeFromTree from MessageNode to ProgramNode

[jecisc]

In multiple projects I'm doing AST manipulation (fro example in Famix or in my project Chanel) and I need to remove some nodes from an AST. Currently it's possible only on MessageNodes but this should be possible on much more nodes. I propose to push up this method on ProgramNodes

[Ducasse]

Do you know if the parent children are updated?
I mean if removing does not break the parent children invariant (referencing each other)?

[MarcusDenker]

Failing tests on win not related:

windows-64 / Tests-windows-64 / Windows64.Traits.Tests.TraitFileOutTest.testFileOutTrait 0.27 sec 1
windows-64 / Tests-windows-64 / Windows64.Traits.Tests.TraitFileOutTest.testRecompiling 8.4 sec 1
windows-64 / Tests-windows-64 / Windows64.Traits.Tests.TraitFileOutTest.testRemovingMethods

[jecisc]

Do you know if the parent children are updated? I mean if removing does not break the parent children invariant (referencing each other)?

Yes, using this method will either remove the node from the parent or replace it by its receiver in other cases