pdnssec check-zone, warn if parsed and original content are not equal
pdnssec check-zone, check for missing NS at apex and records in unlikely places
pdnssec check-zone, improve SOA content check
pdnssec check-zone, improve duplicate checks
pdnssec check-zone, fix record counting and improve out of zone check
Merge pull request #1037 from mind04/pdnssec

pdnssec check-zone improvements, fixes #684