correct semantic SQL indexes for use of xml_child_seq etc
update xbrlDB DPM interfaces for database changes, specifying instanc to save by id, and null value handling
update nil value validation
update decimals/precision validation (for non numeric facts)
provide createFact option to defer xml validation (when creating tuples
that would be invalid before tuple contents creation, e.g. filing indicators)
update xml value ellipsis and cntlr xml error log ellipses so empty
strings don't get ellipses added