+* remove expression "rrset" from source files
+* defend our entries on incoming goodbye
+* allow NULL bytes in TXT records
+* add flx_server_add_service_strlst() and friends
+* change flx_* to avahi_*
+* Unicast responses/queries
+* Legacy unicast
+* no flush bit in known answer
+* always set AA
+* check: TC bit is valid for queries ONLY
+* add SRV and TXT records referenced from PTR records automatically to packet
+* add A and AAAA records referenced from SRV records automatically to packet
+* support known answer suppresion for incoming unicast queries
+* check wether RRsets are supported correctly (i.e. that all records of an
+ RRset are really sent if it is requested) (rfc 2181)