Divert /etc/wtop.cfg to $VIRTUAL_ENV/etc/wtop.cfg when in a virtualenv
refactored cfg_file handling (install and usage)

- updated setup.py to install cfg_file to appropriate location
  (virtualenv, --user, or python lib)
- update logrep.py to search above paths, also PYTHONUSERBASE, and
  finally /etc/wtop.cfg
- added debug()
whitespace clean-up
removed unused import and commented out unused variable
updated hep for new cfg_file behavior. added -d