Bug 28112: Z39.50 does not populate form with all passed criteria

Bug 28112: Z39.50 does not populate form with all passed criteria

This patch adds output of some already-existing template variables in
the Z39.50 search form so that all parameters can be used to prepopulate
the form.

To test, apply the patch and go to Cataloging.

- Click the "New from Z39.50/SRU" button
  - A window should pop up and the form should be empty.
  - Confirm that searching works correctly.
- Perform the same test from a bibliographic detail page using the Edit
  menu -> Replace record via Z39.50/SRU.
  - Some fields in the search form should be prepopulated, e.g. ISBN,
    title, author.
- Paste this link into your browser:
  http://path.to.your.koha/cgi-bin/koha/cataloguing/z3950_search.pl?frameworkcode=&isbn=isbn&issn=issn&title=title&author=author&dewey=dewey&subject=subject&lccall=lccall&controlnumber=controlnumber&stdid=stdid&srchany=srchany&publicationyear=publicationyear
  - The search form should appear with all fields prepopulated.

- Perform the same tests in Acquisitions with the option for adding to a
  basket via an external search.
  - The link for testing all parameters:
    http://path.to.your.koha/cgi-bin/koha/acqui/z3950_search.pl?booksellerid=4&basketno=3&isbn=isbn&issn=issn&title=title&author=author&dewey=dewey&subject=subject&lccall=lccall&controlnumber=controlnumber&stdid=stdid&srchany=srchany&publicationyear=publicationyear

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>