remove excess comments, make Win32API call style consistent
remove manifests directory. It has nothing in it.
make default broadcast_timeout 100ms.

Broadcasting doesn't even work when puppet is running in the background,
which it usually is, so there isn't any reason to be waiting 5sec per
window.
fix module name
make 'user' a namevar

Want to be able to create environment variables with the same name and
value but different user, so user needs to be part of the resource's
identity. (Wasn't quite done with #3 after all).