Bug 20898: Replace OPAC detail's results browser with non-JavaScript version

Bug 20898: Replace OPAC detail's results browser with non-JavaScript version

This patch moves generation of the OPAC detail page's results browser
from JavaScript to the template. This makes the template easier to
understand and easier to debug. It also makes it possible for the widget
to be completely non-dependent on JavaScript.

To test, apply the patch and regenerate the OPAC CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client)

 - Enable the OpacBrowseResults system preference and perform a search
   in the OPAC which will return multiple results.
 - Click on any title in the first page of search results.
 - On the bibliographic detail page there should be a "Browse results"
   link in the right-hand sidebar just as before.
   - Test that the "Previous," "Back to results," and "Next" links work
     correctly.
   - Click the "Browse results" link. A list of the first 20 search
     results should appear. An arrow should indicate the title you're
     viewing.
   - Click any title in the results browser. The page should correctly
     load that record.
   - Clicking the numbered links at the top of the results browser
     should do the same.

Signed-off-by: Cab Vinton <bibliwho@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>