LP#1251394: Seed data changes

LP#1251394: Seed data changes

Removing the topic_subject map, since it ends up with single terms rather than
the more useful "--"-separated full subjects.  Also added an "all creators"
mapping so that if the default "author" is empty for a record, the display
logic can do its best to find an appropriate value.

Gone, again, is the representative_field structure from the baseline (and from
my upgrade changes).

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Bill Erickson <berickxx@gmail.com>