Minor changes

main.py modified, small bug in logging is fixed, feature request
is added to TODO.

This commit is intended to save the state of the program during
a particular evolutionary experiment (see https://docs.google.com/
document/d/1MLPGYKzeDlH042ZWT6AX8W2v78-eZMMQvpmCfxUzMvg/edit?usp=sharing).