Add Maple post with mw2txt.py script.
mw2txt.py: Update to version 0.2 (mostly Python 3 conversion)

Also:
* Use logging module instead of `if debug: print(...)`.
* Rework coloring to work with a logger (e.g. don't print debugging
  info directly to stdout).
* Upgrade from optparse to argparse.
* Add --verbose argument.
Restructure as a stand-along project

The previous two commits were cherry-picked out of
git://tremily.us/blog.git (where they were commits 1f0bb05 and
b85f840).
COPYING: Add the GNU GPLv3

Downloaded from https://www.gnu.org/licenses/gpl-3.0.txt.
Initial commit
first commit
updated README: describing scope of project