[gamma.parser.parse_command] replace *args parameters in lin_comb
[gamma.parser.parse_command] replace *args parameters in lin_comb

this was necessary since the command lin_comb may take a number of files
and factors as arguments which are not directly defined as parameters
similar to Python's *args. The Python function lin_comb instead takes
two lists for the files and parameters respectively

johntruckenbrodt/pyroSAR,johntruckenbrodt/pyroSAR