[FIX] Changes added to fix Tiki Importer - Mediawiki issue . Ref: http://dev.tiki.org/item4931

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48535 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] mail: Allow subject to be reset - should fix tracker problem in wish4945 (thanks Geoff)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48536 b456876b-0849-0410-b77d-98878d47e9d5