Bug 18351: Able to delete budget with funds

Bug 18351: Able to delete budget with funds

To test:
1) Create a budget, add a fund
2) Delete budget. Notice this is successful and triggers no warning
message etc.
3) Go to Funds. Notice the funds appear as if they are not there
4) Go into mysql and view the aqbudgetperiods table - notice the funds
are still there and are now inaccessible.
5) Apply patch
6) Create a budget, add a fund
7) Attempt to delete budget. Notice you can't click Delete button.
Confirm number of funds in hover message is correct.
8) Delete fund
9) Confirm you can now delete budget.

Sponsored-by: Catalyst IT
Signed-off-by: Felix Hemme <felix.hemme@thulb.uni-jena.de>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Bug 18351: [FOLLOW-UP] Some code fixes

See Comment 5. Ready to test.

Signed-off-by: Lee Jamison <ldjamison@marywood.edu>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Bug 18351: [FOLLOW-UP] Code fix

See comment 10.
Ready for testing.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Bug 18351: [FOLLOW-UP] Prevent deletion from forcing URL

This patch adds a check in the script for existing funds so that the
budget cannot be deleted when forcing the URL and has other small fixes.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Bug 18351: [FOLLOW-UP] Prevent deletion if funds are added after clicking 'Delete' and before confirming delete

Followed test plan and patch works as described.

Signed-off-by: Dilan Johnpullé <dilan@calyx.net.au>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>