Bug 9431 [Revised] Use DataTables on Patron Category Administration page

Bug 9431 [Revised] Use DataTables on Patron Category Administration page

Replace the tablesorter plugin with the DataTables plugin on the
patron category administration page. Structural changes were made to the
table markup for validity and to deal with a DataTables bug which
prevents it from properly parsing a <th> with a colspan.

To test, open the Patron Category Administration page (Administration ->
Patron types and categories). Confirm that table sorting works
correctly.

Revision adds a "natural sort" plugin to the main datatables
configuration JavaScript file to enable sorting of columns like those in
this table which include mixed numeric and text data. Allows correct
numeric sorting of data like "0 years, 1 years, 2 years, 18 years," etc.

Further revision corrects template path to datatables assets.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Comment: Sorting works. No errors.
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>