NSD 3.2.1 in MacPorts

Hello NSD users,

I've updated the NSD port in the MacPorts tree to version 3.2.1, so that
MacPorts users on OS X can install it with a simple "port install nsd"
command. The port has two variants, viz. "stats" and "rootserver".

Note that after installing the port, one still needs to copy
PORTBASE/etc/nsd/nsd.conf.sample to PORTBASE/etc/nsd/nsd.conf and
customise it.

Feedback is welcome.

Regards,