Fix PS1 which cause of http://code.google.com/p/mintty/issues/detail?id=296
(unescaped non-printable chars).
All files from gavenkoa-skel project under public domain if this
term applicable in your national low.
In other cases I allow do anything you want with this files.
NOTE: Some international/national lows preserve some inalienable
rights for authors like:
* XXX
Be careful!