[MOD] Change default to Mysql index for unified search

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48488 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] tablesorter: better handling of external filters to avoid potential conflicts with column filters with new way filters are handled in tablesorter

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48494 b456876b-0849-0410-b77d-98878d47e9d5