ARELLE-267, periodEnd should return set, not list ARELLE-268, custom function signatures indexed both by qname alone and by qname, arity
ARELLE-267, periodEnd should return set, not list
ARELLE-268, custom function signatures indexed both by qname alone
and by qname, arity

sternshus/Arelle,sternshus/Arelle,sternshus/Arelle,sternshus/Arelle,sternshus/Arelle