renamed model to agent
renamed FacilityAgent->Facility
renamed InstAgent->Institution
renamed RegionAgent->Region and fixed dup constructor issues
renamed model->agent (lower case) including file names
GenericResource->Product
rename GenRsrc->Product
renamed generic_resource.* to product.*
kill last remnants of generic resource
querybackend->queryablebackend
renamed query_engine to infile_tree
renamed infile tree name methods