Made the Region field for Cell record in dialogue subview editable but not sure if this is the wanted behaviour.

Also removed a duplicate UniversalId::Type_Class mappin in tablemimedata.cpp.
Ignore duplicate connections.
Cleanup signals when finished.
Build objects and connections only once.
Since commit 8bce460f3446df7347d9426675beae2b94e03c1f negative value checks no longer make sense.  Not sure what to do about Vampire flag, however.
Deal with signal source being overloaded.  Clear filename after creating a new addon.  Enable "Open" button if a game file is already selected.
Merge remote-tracking branch 'cc9cii/Bug-No-1864'
Merge remote-tracking branch 'cc9cii/Bug-No-1725'

Conflicts:
	apps/opencs/model/tools/bodypartcheck.cpp