accounting: also reset bank reconciliation after clone

(cherry picked from commit c18908efffea58d7aec98c063217a009769046c4)
Accounting/Payment Mean: fix the way relationship to PTG is reset on copy & paste

The previous way was duplicating transaction references since
AccountingTransaction_afterClone was no longer called.

(cherry picked from commit d68b9933099f32975709972d7d733016c7c5f436)
Accounting: early support of aggregated items in reports

(cherry picked from commit be92ed3f251634515ec429234e4b765dc29dacba)