Top-down budget only for activities with budget

Previously, if the bottom-up budget was used to generate a top-down budget, the activities with a zero budget were also used. This resulted in leaf nodes with a zero amount budget.

To skip activities that have no bottom-up budget, the Only include Activities with Budget check box has been added to the Generate Structure and Top Down Budget (tpptc5210m000) session. By default, this check box is cleared. The check box is enabled only if the Copy Activity Budget Lines check box is selected.