Update WDLC to be compatible with Python 3

[robszewczyk]

WDLC should be fully functional in a python 3 environment.

[gabrbedd]

In Ubuntu 20.04 (LTS), they've dropped a lot of python2 support, making it extremely hard to build wdlc in Ubuntu. Specifically:

• python2 is not installed by default
• The user needs to create the /usr/bin/python symlink
• The python-pip package has been removed.

[robszewczyk]

FWIW, this is being addressed by pull request #40