[FIX] tablesorter: allow for use of group headers, except when ajax is used (until reported tablesorter bug 437 is fixed); do not allow auto-dropdowns when ajax is used (until tablesorter bug 436 is fixed); remove group font styling

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48734 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] tablesorter: set offset properly in simplified ajax url

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48735 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] tablesorter: use standard parameter description for PluginTrackerlist

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48736 b456876b-0849-0410-b77d-98878d47e9d5