From Valeriy Onuchin: - propagate TGCompositeFrame::SetCleanup(-1) to all child_composite frames.   Comment on using hierarchical cleaning added.
From Valeriy Onuchin:
- propagate TGCompositeFrame::SetCleanup(-1) to all child_composite frames.
  Comment on using hierarchical cleaning added.

Attention!
   Hierarchical cleaning is dangerous and must be used with caution.
   There are many GUI components (in ROOT and in user code) which do not
   use Clean method in destructor ("custom deallocation").
  Adding such component to GUI container which is using hierarchical
  cleaning will produce seg. violation when container is deleted.
  The reason is double deletion: first when Clean method is invoked,
  then at "custom deallocation".
  We are going to correct all ROOT code to make it to be
  consitent with hierarchical cleaning scheeme.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@10240 27541ba8-7e3a-0410-8455-c3a389f83636

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