Accept ISO 8601 normalized date ranges.

Requires ability to set XML tag attributes, which are built into the field_map with hashes.
Allow setting series extent
Pretty straightforward
Add physical description tags
Add physloc tag
Add genre/form tag
Demand instance type
Add additional note field.
Incorporate bioghist (Biography or History) tag.
Restore original number/title/dates arrangement construction.
Incorporate language tag.
Incorporate ROLE attribute of controlaccess tag.
Optionally iterate through multiple numbered controlaccess tags.
Incorporate <dao> tag.
Merge branch 'series_extent'