added add_spending_subsidy remove_spending_subsidy
added select_spendings_subsidy
added consumed_amount_subsidy - extended select to array of tags
wip
corrected select_subsidies_tag_array
reorganised code - created global.php
select spendings and subsidies by binet
added selection by validation
increased and corrected selection by validation
selection by validation extended to subsidy selection by binet
extended selection by validation to spendings of a subsidy