Bug 17978: Check if hold can be placed before placing on placerequest.pl

Bug 17978: Check if hold can be placed before placing on placerequest.pl

To test:
 1 - Set an All/All/All rule with reserves limited 2 to
 2 - Search in the staff side
 3 - Select all records (or more than 2) from the results
 4 - Click 'Place hold'
 5 - Find a patron, place holds
 6 - You get more holds than you should
 7 - Delete those holds
 8 - Apply patch
 9 - Search and select more than 2 records
10 - Find patron, place holds
11 - Only 2 holds are placed

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>