Make Base_checkOrCreateCheck take a back_account parameter used to override bank account automatic recovery.
Factorize and cleanup check_deposit_workflow and check_payment_workflow validateConsistency script parts related to check validation.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@14532 20353a03-c40f-0410-a6d1-a30d3c3de9de