* libavahi-compat-libdns_sd: implement kDNSServiceFlagsNoAutoRename and missing functions
* libavahi-compat-howl: implement missing functions
* add API to allow user to tell the server that some service is not reachable
* libavahi-compat-libdns_sd: implement kDNSServiceFlagsNoAutoRename and missing functions
* libavahi-compat-howl: implement missing functions
* add API to allow user to tell the server that some service is not reachable