Added one MATLAB implementation of B&H code

This is the version with multiple .m files.

Also added a Python driver script that calls the Matlab function, constructs
text output, parses the text, and returns the results as numbers.
Added Python implementation of B&H code and Python test script

The test script calls each Mie scattering codes and displays the results.
So far, this is a primitive script that does not attempt to analyze
the results or bring in Wiscombe's validation data.
Added another B&H implementation in MATLAB

This version is contained in a single .m file.  There are other files in
this directory, but I'm not sure if they are important.

Also added a Python driver script that constructs a simple MATLAB script to
call the Mie code and print the results.  The Python code then parses
the MATLAB output and returns the result as Python complex numbers.