options. Not yet ready for production use; Special:Revisiondelete is
incomplete, and the flags are not preserved across page deletion/undeletion.
To try it; add the 'deleterevision' permission to a privileged group.
Also split some functions from GlobalFunctions to XmlFunctions.php, added
some convenience functions for building form controls, some more Linker
conveniences for formatting various types of standard link clusters.
