Ucf merge

A basic merge script for playing with ucf. Simple experiments showed the following:
* the quality of the merge mostly depends on the quality of the used plugin
* augeas can hardly ever be used because the resulting keys suffer from exactly the same issues as normal lines in files
* the merge can't do magic. especially when it comes to meta keys (e.g. comments or order) most of the benefits gained by abstracting a configuration are lost because it boils down to a simple text merge

However, I am confident that some of these issues can be mitigated by a handful of high quality storage plugins and more sophisticated merge strategies.
Did you mean $# instead of $?.