preliminary working fromfilePrefixChars implmentation with test adaptated from python
cleaned up code
test/fromfile.js - mocha test file
Add the python custom convertArgLineToArgs test

use before and after to setup the files, rather than beforeEach
so testing is less dependent on file system response
cleanup argument_parser; remove debuging lines
passes make test
change fs.rmdir to rmdirSync to more reliably remove the tmp dir
remove test_fromfile.js; fromfile.js is better