[15.0][IMP] account_check_report many fixes and improvements

[AaronHForgeFlow]

[FIX] account_check_report: payment amount should consider current payment and not other payments

[IMP] account_check_report: show amount residual at the payment date, not on today's date

[IMP] account_check_report: show direct refund applied on invoices paid by the check e.g. 2 invoices and a refund for those 2 invoices should appear, even if the refund includes separate invoices

[IMP]account_check_report: button invoices show all related invoices + direct refunds

[IMP] account_check_report: add test coverage

[IMP] account_check_report: do not print more than one line by invoice. Currently, if there are several receivable/payable lines, for example, due to payment terms the invoice appears multiple times

[FIX] Do not show "Check: False" when there is no check number, do not show anything instead.

Kind of forward porting this #397 --> Screenshots for the different fixes are provided there

The changes in the payment document itself can be reverted if only the report is accepted.

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[AaronHForgeFlow]

One of the main needs for this fix is the first one:

[FIX] account_check_report: payment amount should consider current payment and not other payments

For example, when having to bills, for $2.99 each and 2 payments for $1 and $ 4 where the matching is the following:

bill1: reconcile with payment 1 --> amount residual left $1.99 (payment 1 applied $1)
bill1: reconcile with payment 2--> amount residual left $0 (payment 2 applied $1.99)
bill2: reconcile with payment 2--> amount residual left $0.98 (payment 2 applied $2.01)

When we print the report on the first payment (right part of the following image) we see that the payment amount is $2.99. This is incorrrect, as only 1$ was applied. The left part of the image shows how it looks after this fix

Same thing with the report for for the second payment. It pays $1.99 on the first invoice, not the total amount:

[AaronHForgeFlow]

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