improving loading performance. The masterfile-format
option in named.conf can be used to specify a
non-default format. A new separate command
named-compilezone was provided to generate zone files
in a new format.
named-checkzone has extended checking of NS, MX and
SRV record and the hosts they reference.
named has extended post zone load checks.
New zone options: check-mx and integrity-check.
[RT #4940]