[#50578721] add the department assignments ajax lookup, including
filtering and sorting. Not yet working: cong name sort, role name
filering (needs new hibernate mapping since role is only reference data
just now)
[#50578721] enable sorting/filtering on the department assignment role.
To support this we had to add the assignment role into the hibernate
mapping. The cache reference data is still the general use case
[#50578721] make the reference data table strucutres more consistent. We
had a mix of id/name and id/description.
[#50578721] correct the assignment volunteer sorting by cong. name
[#50578721] include the department assignment action column, linking to
the person