Roman numeral conversion tools

The scripts (and functions) r2n and n2r will convert roman numerals to integers and natural numbers to roman numerals, respectively. Error handling is nonexistent.

Works:

• Conversion to/from integers in standard form with absolute value of 1-4999 or 0, when represented with 'nulla'
• Conversion to/from integers, when the overline in vinculus forms is replaced with parentheses groups.

Doesn't work:

• Input validation: Use -f and input clean inputs or face errors.
• Decoding some rarer "nonstandard" forms.

TODO:

• Decoding vinculus forms to/from LaTeX etc..
• Nice errors handling / warnings.
• Proper packaging: verify that pip works & register to PyPi