PyNEMO expects two command line arguments and crashes if it doesn't get them
Created by: thopri
This may apply to the IMMERSE branch only but if 1 or no command line arguments are used with pynemo e.g. pynemo or pynemo -h then PyNEMO crashes with an indexing array error.
It looks like it is always expecting two command line arguments even though options for none and one are defined.
Normal behaviour with -s and -d are unaffected.