Milestone Avahi 0.6.22

This is an important bugfix release, and adds a couple of new features.

• i18n support
• Documentation and example code updates
• Support for registering the Avahi documentation in devhelp (needs manual setup)
• Added a new component libavahi-gobject, which is a GObjectified version of the Avahi API, contributed by Sjoerd Simons
• Major BSD compatibility improvements, contributed by "zml"
• avahi-ui: Allow overwriting of pretty service name by the application
• Service type database updates
• Add new option --parsable to avahi-browse
• Minor other updates