changed title of unknown codes emails * don't need month name in daily emails, retained for monthly priority email

standardised getopts 'd' for scripts using days * for inter-script consistency and disambiguity with 't' (for testing)

amend national_code_unknown.pl to run every day * previously exited unless 1st day of month, last working day of month, or Sunday

changed today() to return time_now() after national_code_unknown.pl failed to run on Sunday - possibly due to lack of timezone setting for BST; also changed possibly faulty logic in code determining whether to run; put incomplete tests filter on incomplete, unreported and unauthorised worklists

fixed incorrect date calculation of 1st of next month - eg +1 month on 29th Jan is 1st Mar; added 'PRIORITY' to message subject if last notice before billing code runs

skipped Sunday if last day of month; added ARGV override for JUST_TESTING

improved get_query_params() code, skips Sunday if 2nd of month

replaced multi/national_code_unknown.pl with daily script which exits unless Sunday, 1st of month, or last working day of month