Prior to changing database column.
Turned on chunking.
Added the sentinel of -2 absolute score for parametrically bad
Merge.
Merge branch 'sean_time_filter' of github.com:QRAAT/QRAAT into sean_time_filter
Working on new bearing, activity and position schema.
Merge branch 'master' into tracking
Finished changes to position.py.

qraat.position.calc_position() now returns bearings and positions.
Updated rmg_position_auto.
Uncommented signal_filter in python/__init__.py.
Merge branch 'master' into tracking
track.export_kml(): export positions as well.