Implement overlay of deserialized decls and Transaction: handle decls coming in from either one, during the same transaction, without double counting.
Don't update the type of a namespace - it will still be NULL.
Comment spelling.


git-svn-id: https://root.cern.ch/svn/root/branches/dev/root6-pch@48925 27541ba8-7e3a-0410-8455-c3a389f83636
Fix spelling of var name.
Reset the caches even for namespace decls.
Clarify that the parameter can as well be a NamespaceDecl.
Remove debug statement.


git-svn-id: https://root.cern.ch/svn/root/branches/dev/root6-pch@48926 27541ba8-7e3a-0410-8455-c3a389f83636