Arrival light

This procedure should be followed on receipt of new flight data from ARSF.

1. copy to appropriate location on the filesystem (~arsf/arsf_data/2007/flight_data/...)
   1. ensure the directory name conforms to the standard - PROJECTCODE-YYYY_JJJxx, e.g. GB2007_05-2007_116b, boresight-2007_198, etc
   2. rename any capitalised subdirectories
   3. prune empty directories? (need to think about this, maybe only do after checking it's not a stub for later data)
2. raise a trac ticket (type 'flight processing') for the new data