Bug 23307: Add columns configuration to cataloguing/z3950_search.tt

Bug 23307: Add columns configuration to cataloguing/z3950_search.tt

This patch adds columns configuration to the DataTable which displays
Z39.50 search results in the cataloging module.

The Z39.50 results screen has its own server-side paging system, so I
added some code to copy the page number information ("Page 2 / 6") to
the DataTable toolbar for a more consistent appearance. The wording of
that information has also been modified for consistency's sake.

To test, apply the patch and restart Plack (or restart_all on
kohadevbox)

 - Go to Cataloging -> New from Z39.50/SRU.
 - Perform a Z39.50 search which will return multiple pages of results.
 - Confirm that the DataTable controls work correctly: Search, columns
   show/hide, export.
 - Confirm that the page number information is correct as you navigate
   through pages of results.

 - Go to Administration -> Columns settings.
 - Confirm that the columns configuration settings for the z3950_search
   table in the "Cataloging" section works correctly. Changes made here
   should be reflected in the table of Z39.50 search results.

 - Test other tables which use columns configuration to confirm that the
   changes made in this patch doesn't disrupt their behavior. Test that
   any custom columns configuration are applied. For example:

   - Administration -> Libraries
   - Reports -> Saved reports
   - Circulation -> Holds queue

Signed-off-by: George Williams <george@nekls.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>