Bug 26247: Adding 2 Sysprefs for Search Terms

Bug 26247: Adding 2 Sysprefs for Search Terms

This patch adds two system preferences options : 'RetainCatalogSearchTerms' and 'RetainPatronsSearchTerms'. If enabled, search terms will be retained between searches made from, respectively, the Search Catalog header and the Checkout or Search Patrons headers. If disabled, the searchbars will clear out between page loads.

Attention, this is an alternate solution from the previous patches, ONLY apply this patch when testing and not the previous ones.Changed the syspref wording as well.

To test:
1 - From the staff client, search some terms using the Check out header search bar.
2 - Confirm search terms are retained.
3 - Do Step 1-2 twice again, this time using the Search patrons and Search the catalog.
4 - Apply patch (again, only this one), update database.
5 - In the system preferences, look for RetainCatalogSearchTerms and set it to 'don't retain'.
6 - Use the checkout head search bar again, confirm that search terms aren't retained after page load.
7 - Do Step 5-6 once again, this time with the RetainPatronsSearchTerms and the Search Patrons and Search the catalog headers.
8 - Search boxes should be cleared.

Thanks-to: Fridolin Somers and Nick Clemens for the bases I built on.
Signed-off-by: Florian Bontemps <florian.bontemps@biblibre.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>