stable vs. unstable trees

[Michael Cardenas]

To move forward from the discussion we've been having about supporting a 
particular list of applications, I'd like to propose that we have a 
stable and an unstable wine tree.

In this way, we can have new patches from developers go into the 
unstable tree, and once a release has been tested for a while and works 
well for the list of applications with maintainers, then we move it to 
the stable branch.