renamed clients/dbgutil.py to green/debug_util.py

darcs-hash:20090128131349-b2873-ff15d52ea2cf7f83ffc0fb296b145827f8425277
add docstring for some of the modules

darcs-hash:20090128132434-b2873-fb1a47e74b659db6388cffed4c568be4c0b06bc9