Fix schema.org mapping for MusicAlbum, add Map

We had set LDR[06] = j to MusicRecording, but that is really meant for
individual songs. Use MusicAlbum instead, and per
http://schema.org/MusicAlbum, use a new MusicGroup itemtype with a
'byArtist' property for the primary artist rather than the generic
'accountablePerson'.

Also map LDR[06] = e to Map, because that seems like a safe bet.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Mike Rylander <mrylander@gmail.com>
TPAC: Fix schema.org name / dates for authors

Per http://schema.org/Person, the birth date and death date are not
supposed to be part of the name of a Person. We can separate these out
correctly based on subfield d for 100 fields.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Mike Rylander <mrylander@gmail.com>
TPAC schema.org: Add Organization types for contributors

Given a 110 / 710 field, when generating the record details for authors
and contributors we can declare an http://schema.org/Organization
itemtype rather than just jamming the name under the "contributor"
property. This is more in accordance with schema.org directions.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Mike Rylander <mrylander@gmail.com>