let's add more cell traits and interesting behaviors

[7yl4r]

More cell traits can be added fairly easily. An example:

cell mass

• mass is proportional to strength
• mass is inversely proportional to speed

strength and speed are used in the 'move' phase. Higher strength allows cells to push or consume other cells, and a higher speed allows for more agile movement.

to implement this:

• add mass up/down codon lists in cell.py as well as a function getMass. HINT: you don't need to search for the string yourself, there should be a function in cell.py that does that in a general fashion.
• create a new top-level script for evolving cells with fighting rules (or something). This script will be similar to evolveWithMovement.py, but with the added code for strength/speed handling.

[7yl4r]

List of cell movement traits based on behavior of "bugs" in qtbugs:

• max age
• min/max energy
• move/stay energy costs