Add foreign key constraints to various tables: bugs_activity, cc, dependencies, votes, attachments, attach_data, duplicates, flags, flagtypes, flagexclusions, flaginclusions Patches By Tony Fu <tfu@redhat.com> r=mkanat, a=mkanat git-svn-id: svn://10.0.0.236/trunk@251735 18797224-902f-48f8-a5cc-f745e15eee43