Release 7.3

Change with release 7.3
 - Remove compatibility code for BVR/ESR only Multi BVR/ESR is supported
 - Add credit control integration with ESR
 - Add intergation with account bank reconciliation addons https://launchpad.net/banking-addons/bank-statement-reconcile-7.0 with module  l10n_ch_payment_slip_base_transaction_id
 - Uniformize  management of reference