refs #937 @30m

- In IXFR/AXFR processing replaced rrset_merge() by
  rrset_merge_no_dupl().
- In some other cases it is not reuqired.
- Modified rrset_compare() function to not check TTL
  TODO: check if this doesn't cause problems elsewehere.
- Needs some testing.

refs #1953 @20m

refs #1961 @15m

+ Small fix to search for a RRSet in a packet.

refs #1927 @1h

TSIG is now detected while parsing the RR sections. If it is
there, it is stored in the packet. This also allows for checking
whether TSIG is not in a forbidden place, or whether there is
only one TSIG, etc.

Also removed all TSIG recognition code from other parts of the
server. Not needed anymore.

refs #1522 @1h

TODO: Use the new functions in all possible cases, there are more
      possible, mostly where ns_error_response() is now used.

refs #1918 @1h

- Now should be finally correct. If there is less or more data
  than expected, the packet is treated as malformed.

refs #1910 @1.5h

- Changed check to decide whether to parse rest or not.
  Hopefully this does not break other cases.

refs #1320 @30m

refs #1890 @3h

- In some cases, the compression table was not correctly freed.

- Adding Options only if NSID is requested (this is bit hackish).
- Freeing OPT RR Options on packet free.

refs #1547

- Returns EOK when the transfer was successful (connection should
  not be closed).
- Returns error code (< 0) if any error occured. Error message
  has been sent and the connection should probably be closed.

refs #1530 @20m

@30m

- Storing TSIG-related information for answering.
- Signing error answers.
- Adding TSIG to TSIG error answers.
- Storing pointer to TSIG RR in the packet structure.

refs #1496

- Was expecting there would be RRSets with only one RR in
  additional section.

- Parsing unknown RDATA (TYPExxx) from packet.
- Parsing IPSECGATEWAY with no gateway item.

refs #1362 @20m

- It does not try to parse anything if the whole packet is already
  parsed.

refs #1362 @1.5h

+ Fixed reserving space in query_add_authority() - was not
  reserving space for OPT RR (probably not needed, but better for
  tidiness).

refs #1362 @45m

- If labels are not parsed well, error is returned

Warning: This check was commented as if it was wrong in some case.
         Don't know why and enabling it may cause some problems.

refs #1333 @10m

refs #1333 @15m

- Trailing garbage (i.e. more data than expected from the xxCOUNT)
  is ignored and the packet is processed as if there were no such
  data. (This behaviour may change later according to other servers
  - see #1336).
- If the packet contains less data then expected (xxCOUNT larger
  then real count of RRs in the corresponding section), FORMERR
  is returned.

refs #1333 @1h

refs #984

refs #1297 @15m