Bug 2735: Fix authority search pagination at the OPAC

Bug 2735: Fix authority search pagination at the OPAC

The authority search pagination displays only 15 pages, even when there
are more.
To fix that, this patch mimic the authorities-home.pl intranet script to
manage the pagination.

Test plan:
Without this patch, do some authority search and click on different
pages.
Apply this patch, redo the same search and make sure the same records
are displayed (i.e. confirm that the pagination still works as before).

Signed-off-by: Nicole C Engard <nengard@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>