Add fields for pulling location data from ArchivesSpace into Aeon

[AustinTSchaffer]

The plugin does not currently pull in location data from the containers for each request. Top containers in ArchivesSpace can have multiple locations, so the plugin should concatenate fields for each container.

At the minimum, the plugin should pull in the location title, which should be enough to identify the location from Aeon. The title field in the location model is a (readonly) formatted string that contains the information from most of the other fields in the location model:

• building
• floor
• room
• area
• barcode
• classification
• coordinate_1_label and coordinate_1_indicator
• coordinate_2_label and coordinate_2_indicator
• coordinate_3_label and coordinate_3_indicator

This field should be included as the field name instance_top_container_location_title, to go along with the other per-instance fields that start with instance_.