Additional features requested for payment group info

[risto3]

For the recent push concerning:

Additional informations on Payment Group

Rational Currently, payment Group have only few information directly available to the user: the group number the journal used the kind of operation (receivable or payable) When manipulating Group (via Statement for example), choosing the right Group couldn’t easily be done, as all Group are showed, and information directly available is inexistant (only the number is usually useful). Proposal Adding some computed fields on Group could be easily done. count : number of payments associated t…

there seems to be perhaps some additional things needed:

1. an initial filter on payment groups should probably be added: ‘completed:false’
2. it would be nice to have a tree view instead of a flat view which necessitates double clicking on each entry to find the date(s) of the payments in the group … which should then be grouped by date. (NB: the sepa_group_payment_id could/should be shown here as well)
3. it seems impossible to order descending by number, the ordering is done by text which is somewhat annoying (this is already reported here:sorting payment groups by number needs to sort numerically (#9344) · Issues · Tryton / Tryton · GitLab)