Updated code for schema changes to qraat.est.

signal_filter.py, est.py, position.py.
Updated scripts related to est table.
Merge branch 'master' into schema_update

Conflicts:
	server/python/signal_filter.py
Fixed errors in processing associated with table `qraat.est` updates.
Moving to new site list schema.
Adapted code for new site schema.

Changed table and column names for position, track, and
track_pos in code.
Migrating schema: fixed bugs in rmg_track_auto.