EDNS -- finish EDNS0 support 
DNSSEC - validation and the remaining records, DS (encoding), NSEC and NSEC3
unknown RRs - if I ever get around to make it


convience functions
parsing from strings
"miek.nl IN A 192.168.1.2" -> <correct Go type>
in msg.go, clean out the code and put it in helper functions

quotes in quotes in txt records
fix os.Erros usage (extend or whatever)