[REF] tablesorter: move implementation for PluginFancytable to new core implementation, which can be extended to other plugin tables. Also other cleanup: separate ajax from pager in settings and add more checks for empty/expected values to avoid notices and errors.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@46644 b456876b-0849-0410-b77d-98878d47e9d5