=item DoBrangefromAges REFERENCEDATE MINAGE MAXAGE
Given a REFERENCEDATE from which to calculate, minimum age MINAGE, and
an optional maximum age MAXAGE, this function returns two strings in
YYYY-MM-DD format, suitable for use in SQL queries, e.g., 'WHERE ?<dob
AND dob<?', using the return values in order as parameters. If no
MAXAGE is given, date range is for the year spanning MINAGE only.
=cut
sub DoBrangefromAges {
	my ($querydate,$agemin,$agemax,$inclusive) = @_;
	die "[E] Minimum age omitted in DoBrangefromAges" unless (defined $agemin and $agemin ne '');
	$agemin = int($agemin);
	$agemax = int($agemin) unless defined $agemax;
	$agemax = int($agemax);
	$inclusive = ($inclusive ? $inclusive : 0);
	my ($maxdob,$mindob) = ($querydate,$querydate);
	$maxdob->subtract(years => $agemin);
	$mindob->subtract(years => $agemax + 1);
	return $mindob->ymd('-'),$maxdob->ymd('-');
}