Fix for Bug 6501 - missing scroll bar when updating child

Fix for Bug 6501 - missing scroll bar when updating child

- Adding "scrollbars=yes" to window.open javascript.
- Adding javascript tablesorter to categories table

To test, open a child patron record and choose more ->
Update Child to Adult Patron from the toolbar menu. The
resulting pop-up should have scrollbars. The table
of categories should be sortable with a default sort
on the description.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>