[T6777] modificar reporte partidas abiertas

Merged Pablo Ferreira requested to merge T6777 into 17.0

patch two methods in order to accumulate the values of the columns Acum. Inicial and Acum. Residual

https://eynes.com.ar/web#id=7290&cids=1&menu_id=125&model=project.task&view_type=form

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