FIX /etc install failing in ubuntu
FIX /etc install failing in ubuntu

in linux, os.access(file, W_OK) returns false if file doesn't exist,
even if dirname(file) exists and os.access(dirname(file), W_OK) returns
true. we're fixing this bug.

more yet, we must do not install a new config file if someone is already
installed.

rarylson/update-conf.py