todo:
-* Probing/Conflict resolution
-* uniqueness
-
-* defend our entries on incoming goodbye
-
* Unicast responses/queries
* Legacy unicast
-* remove expression "rrset" from source files
-
* add SRV and TXT records referenced from PTR records automatically to packet
* add A and AAAA records referenced from SRV records automatically to packet
* allow NULL bytes in TXT records
done:
+* Probing/Conflict resolution
+* uniqueness
* respect escaping in name serialization
* really send goodbye packets
* refresh subscribed records only
* Known-Answer suppression server part
* make flx_server_add_text() and flx_server_add_service() variadic functions
* name compression
+* remove expression "rrset" from source files
+* defend our entries on incoming goodbye