Draft of function addObservedHeadways() in RTIDBBuild.py [untested]
Replaced AB_GTFStoSQL.py with GTFStoPostGIS to better reflect what it does.
Snapper data is now placed into tables in a PostgreSQL database, not SQLite.
Fixed error with headway calculation from GTFS
Fixed error with headway calculation from GTFS; changed usage
Final (!) changes to GTFS-derived headway calculations