introduce Node.GetRootAncestor<TAncestor>(), document GetAncestor* methods.
introduce Node.GetRootAncestor<TAncestor>(), document GetAncestor* methods.

git-svn-id: fcce7d6ce0ac15bf24f68871b5145d46fc068279@3255 2c1201b4-01cd-e047-a400-b836ae1fbc61

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