Tags: Task 2219
[MERGE] add the 'propagate_invoice_date_to_income_withholding' boolean field to
the income withholding document and some fixes in the l10n_ve_withholding_iva
were made module. The new 'propagate_invoice_date_to_income_withholding' field
is used to check if or if not set the voucher date of the wh document.