Add docstrings and doctests to pbot.py + Python cleanups.
-rw-r--r-- 1552 combinations.py
-rw-r--r-- 6985 deck.py
-rwxr-xr-x 1024 p1.py
-rwxr-xr-x 972 p2.py
-rwxr-xr-x 2834 pbot.py
-rw-r--r-- 20134 table.py