Coding style.

- Add xterm colors, and func for finding closest color, to
  termstr.py.
- Remove termstr's dependencies on pygments and ColorMap.py.

termstr/tests/termstr_test.py

@@ -5,7 +5,6 @@ import os
 import pickle
 import unittest
 
-os.environ["TERM"] = "xterm-256color"
 
 import fill3.terminal as terminal
 import termstr