[GNC] Wrong running balances in reports

[finfort at gmail.com]

Appears in reports when you sorting by date and you have 2 transactions 
of the same date.

Needs recalculation of running balance.

Example of General Ledger report:

VAT Output                     Dr                Cr     Running Balance

31/12/19 O.. LTD €25,080.00-€212,124.82

31/12/19 R.. GMBH                    €2,926.00-€187,044.82            
                 (should be 215050.82)

Total For VAT Output   €28,006.00

In this example rows should stay vice versa, like in the editable form 
to have correct running balance.

So the form has recalculation of running balance, the report does not have.