Milestone Avahi 0.6.21

This is an important bugfix release.

• Make avahi-autoipd actually produce correct ARP packets (Identified and patched by Pauline Yeung)
• Add FreeBSD kqueue support for watching /etc/avahi/services (Contributed by Marcus Clarke)
• Use search domain from /etc/resolv.conf as additional browse domains.
• No longer return a conflict error when two local applications register identical RRs.
• Properly find alternative service/host names for very long names
• DNS name compression fix (Sjoerd Simons)
• Fedora init script order fix
• Several fixes to make gcc produces less warnings
• Minor documentation and build fixes