Bug 5672: Gives RSS icons to catalog search history

Bug 5672: Gives RSS icons to catalog search history

This patch adds an extra column to the table for the search history (this session and previous searches) with RSS icons for each search.

Test plan:
* Verify that there is no RSS icons for saved searches in opac
* Install the patch
* Verify that there is no RSS icons for saved searches and searches for the current session in Opac.
* Test that the RSS links produce the expected result.

Note: I left out authority searches since I have very little experience with authority searches and didn't feel I could test it properly.
Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>