Bug 9436 [Revised] Use DataTables on cities administration page

Bug 9436 [Revised] Use DataTables on cities administration page

Replace the tablesorter plugin with the DataTables plugin on the
cities administration page.

To test, open the cities administration page (Administration
-> Cities and towns). Confirm that table sorting works correctly.

Revision corrects template path to datatables assets.
Further revision corrects conflict with Bug 9630

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Comment: Sorting works. No errors.
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Amended patch: Add the aLengthMenu key for DataTables + delete an unused
div block (used for pager)
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>