Fix Zero Balance A/P Checks

The Fix Zero Balance Cheques (APCD02) tool can be used to fix a legacy issue where AP Cheques for $0 never got properly posted or assigned cheque numbers.
There was also no Check History for applied A/P Checks, caused by paying a mixture of negative and positive payments to A/P invoices that total to a net value of zero, but the zero dollar cheque was never created and none of the invoices were paid.