Bug 32565: Add unallocated option to holds queue

Bug 32565: Add unallocated option to holds queue

Add an unallocated option to CreateQueue and pass through as needed
Avoid deletion of the tmp_holdsqueue, and only check holds
and items that are not currently matched

A future hold with a higher priority will still fail here - because the
item may already be assigned, but on next change to the biblio it would
be corrected

To test:
1) Apply both patches
2) Enable RealTimeHoldsQueue and set HoldsQueueSkipClosed to "open"
3) Add a holiday to the calendar for all libraries for today, visit:
/cgi-bin/koha/tools/holidays.pl
-- Click today's day on the calendar and pick "Holiday repeated every same day of the week"
-- Click "Copy to all libraries". Hit "Save.
4) Place a biblio-level hold on a biblio record and set the pickup location to a library that has available copies, visit:
-- /cgi-bin/koha/reserve/request.pl?biblionumber=76&borrowernumber=51
-- Click the first "Place hold" button to place the biblio-level hold.
5) Verify that that hold got added to the holds queue, visit:
/cgi-bin/koha/circ/view_holdsqueue.pl?branchlimit=&itemtypeslimit=&ccodeslimit=&locationslimit=&run_report=1
6) Place a biblio-level hold on a biblio record where there are no other holds and copies are available at another location, but not the pickup location, visit:
-- /cgi-bin/koha/reserve/request.pl?biblionumber=437&borrowernumber=51
-- On the "pickup at" dropdown, pick something else other than "Centerville", e.g. "Fairfield".
-- Click the first "Place hold" button to place the biblio-level hold.
7) Check the holds queue again, notice that this 2nd hold was not added to the queue:
/cgi-bin/koha/circ/view_holdsqueue.pl?branchlimit=&itemtypeslimit=&ccodeslimit=&locationslimit=&run_report=1
8) Run the updated cronscript:
perl misc/cronjobs/holds/build_holds_queue.pl --force --unallocated
9) Notice nothing changed in the holds queue, visit:
/cgi-bin/koha/circ/view_holdsqueue.pl?branchlimit=&itemtypeslimit=&ccodeslimit=&locationslimit=&run_report=1
10) Remove the holiday we created previously, visit:
/cgi-bin/koha/tools/holidays.pl
-- Click today's day on the calendar and pick "Delete this holiday"
-- Click "Copy to all libraries". Hit "Save.
11) Run the updated cronscript:
perl misc/cronjobs/holds/build_holds_queue.pl --force --unallocated
12) Confirm the second hold is added to the holds queue, visit:
/cgi-bin/koha/circ/view_holdsqueue.pl?branchlimit=&itemtypeslimit=&ccodeslimit=&locationslimit=&run_report=1

Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>