bind patches for backend
with this patch
- we dont need to enter on every field a ttl (this makes it easyer to change the default ttl for all entrys), just use 0
- we dont need to use domain.tln in the name field, so wie can have hosts with no name which points to the domain itself. It was needet to sort the output, so that NS records came first in the zone file
- we get a cleaner zonefile, which is better to read (for debugging)