* React on signal HUP resync and rewatch everything.
* Allow several source->target specifications.
* Allow more complicated source masks like /home/%1/www/ -> target::%1/
* Workaround the default 8192 watches kernel limit by opening another inotify
  instance when needed.
* React on inotify OVERFLOW messages in resyncing everything, something might
  have been missed.
* Allow more complicated exclusion masks.
* Do not call rsync at all if a file was edited that falls under the exclusion
  mask (currently it is called, and rsync drops it.
* When several things happen at once, wait if calls to rsync can be optimized
* Allow users to specificy more rsync call options.
* Make a manpage.
* improve config.h.in generation