Small change to the InterFits.average_time_frequency function to help deal with files that don't exactly match the temporal and spectral decimation values.  There is now a new 'mode' keyword that can be set to allow the averging function to use as much data as possible.  This new feature has been incorporated into the latest version of convertLEDA64NM.py.  Also, small bug fix for possmLEDA64NM.py to deal with plotting fewer than 25 baselines.