rrset wire: Simpler DNAME decompression + maximum RDLENGTH check.
- DNAMEs are now always decompressed and then there's a check if compressed and decompressed sizes match, in case they shouldn't have been decompressed in the first place. - It is possible to create an RR with compressed DNAME in it, that would be actually bigger than 2**16 - 1. I've added a check for that. - Tests for both mentioned cases pending.
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