cleaned up proc and signal modules for merging to master
added notebook documentation for signal module
Tested signalProcessing notebook
removed music plotting code
added gsMapSlantRange function
gsMapSlantRange now called when model==GS
fixed indent in gsMapSlantRange docstring
using np.nan for invalid lat/lons under GS model
fixed GS model in radFov.py and musicPlot.py
implemented GS model in radFov.py
changed devMusic script
trying to merge master
Put music code back (fixing a merge with master)