[FIX] tablesorter: get external filter working with new version; add ability to explicitly turn groupings on or off; add new js file that should allow pagination to be fixed with some coding changes

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48250 b456876b-0849-0410-b77d-98878d47e9d5