Bug 5396: New system preference UseTablesortForCirc

Bug 5396: New system preference UseTablesortForCirc

This system preference allows the librarian to toggle on or off whether the JQuery tablesort is used on the
circ/circulation.pl page.  For patrons with many checkouts, this sort may cause very slow page loading (and
therefore slow circulation transaction time), depending on the browser and local machine used.  Staff can
still see a sortable list of current checkouts on the members/moremember.pl page.

My revision prevents the template from including *any* tablesorter code if the
preference is feature is turned off: both the circulation list and
the holds list will have no jQuery tablesorter.

Signed-off-by: Nicole Engard <nengard@bywatersolutions.com>
Signed-off-by: Ian Walls <ian.walls@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>