Bug 22679: Delete related CirculationRules when Removing IssuingRule

Bug 22679: Delete related CirculationRules when Removing IssuingRule

Unfortunately, the tables here can't use a foreign key as one table uses null where the other uses
'*' This patchset alters the delete method so delete related rules. It is somewhat of a workaround until
all the columns in issuingrules are moved to circulation_rules

To test:
1 - Add some issuing rules in koha, making sure to set maxissueqty
2 - Check the DB: SELECT * FROM circulation_rules;
3 - note some circulation rules were created
4 - Delete your rules via the staff interface
5 - Check the DB, the circulation rules remain
6 - Apply patch
7 - Repeat
8 - Huzzah! The rules delete!
9 - Prove the tests, read the code

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>