py3port complete

When the Python 3 port has received sufficient testing, it will be merged into
the master branch.  From then on, MMGen will no longer support Python 2.

Users who wish to run current MMGen versions should upgrade their systems with
Python 3 versions of the prerequisite libraries listed on the
Install-MMGen-on-Debian-or-Ubuntu-Linux wiki page.

mmgen/globalvars.py

@@ -38,8 +38,8 @@ class g(object):
 
 	# Constants:
 
-	version      = '0.9.999'
-	release_date = 'October 2018'
+	version      = '0.9.999py3'
+	release_date = 'November 2018'
 
 	proj_name = 'MMGen'
 	proj_url  = 'https://github.com/mmgen/mmgen'