Bug 18989: Allow displaying biblios with all items hidden by OpacHiddenItems

Bug 18989: Allow displaying biblios with all items hidden by OpacHiddenItems

Bug 10584 made Koha hide biblios for which all items match some criteria (in OpacHiddenItems) so they are hidden.
Add syspref OpacHiddenItemsHidesRecord controlling this behaviour.

Test plan :
1)
1.1) Create some biblio records with one item having damaged=1
1.2) Define system preference OpacHiddenItems = damaged: 1
2)
2.1) Set system preference OpacHiddenItemsHidesRecord to 'don't hide'
2.2) At OPAC : perform a search showing those records and some more
2.3) Check you see the all the records
2.4) For a record with hidden item check you don't get HTTP 404 for : normal view, ISBD view, MARC view
2.5) Check you can had tags on this record
2.6) Add record to basket, check you see it in basket
3)
3.1) Set system preference OpacHiddenItemsHidesRecord to 'hide'
3.2) At OPAC : perform a search showing those records and some more
3.3) Check you don't see the records with hidden item
3.4) For a record with hidden item check you get HTTP 404 for : normal view, ISBD view, MARC view
3.5) Show basket, check you see the records with hidden item

Signed-off-by: Kelly McElligott <kelly@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>