- New RRSet merge function has to copy actual RDATA as well, so those have to freed. But not DNAMEs.

- Added debug message to ddns.

It is possible to use algorithm an certificate type mnemonics now.
This case concerns CERT, DS, DNSKEY and RRSIG types.

- First insert node's owner into lookup, then perform rest of the operations.

- Dname might be present somewhere else in RDATA.

- Code review helped.

NOTE: not completed

refs #2137

- Was causing wrong node->owner->node values and thus incomplete
  additional sections.

refs #2137

Coverity scan #989558 (Logically dead code)

- wire_pos in compression info structure was not initialized properly
  (was set to 0 instead of response->size) resulting in bogus
compression (it worked for simple records, but failed for larger ones,
if containing more than one name)
- fixed compilation warnings in debug messages.

Coverity scan #989558 (Logically dead code)