add method for getting the first annotation of a specific type
use firstAnnotationOfType here
create display location instances table
param rename
create geolocations table
add geolocation model object
insert and get geolocations from the database
fill out AATTDisplayLocation
add method for inserting display location instances
use "ID," not "Id"
import AATTGeolocation.h
add AATTDisplayLocationInstances - for holding a set of message ids associated with a display location
make initializer publicly visible
add method for getting all displaylocationinstances in a channel