r11912: fix nbt_name_registration, there's still some minor stuff todo,

r11912: fix nbt_name_registration, there's still some minor stuff todo,
e.g. to return the first address of the 0x1B address as first
     address in the 0x1C reply, and handle sgroup merge overflow
     of 25 addresses

metze
(This used to be commit a80280e061c03f9d07f7d6df20228de7923bb000)