[Opendnssec-develop] checks for changed zone config and zone input files

[sion at nominet.org.uk]

> if I understood correctly, most files are rewritten by the
> communicator, even if
> there are no changes, so there would be quite a bit of parsing
> involved (this is
> just hearsay right now, so please correct me :) )

That is certainly correct at the moment. I can look to change this
behaviour if it makes things simpler.

Sion