Commented out signal_filter.py

This code shouldn't be installed.
python/position.py: reverting to simple band filter.

To get the automated position estimator online, we're reverting
to the simple band filter instead of the full blown signal filter.
Fixred bug in serv/pos/rmg_position_auto.

Skip zero length chunks.
Restarting rmg_position_auto ...
python/position.py: Forgot to remove JOIN on estscore.
position.py: One more stupid bug.
4channel_spectrum: pic_interface class name had changed, use serial USB connection as default
plot_pos.py: Plot four hour chunks.
Merge branch 'master' of https://github.com/QRAAT/QRAAT