log message type is error if ckey is missing when barcode in identity metadata
tweaking tests to make 'em run a teeny bit faster
tighten up code a teeny bit
move doc_hash_from_mods and related methods to gdor_mods_fields
reduce whitespace in all_search, added some comments to pub date fields
move doc_hash_from_mods specs to gdor_mods_fields_specs and improve them too