Commit refs #757.

Commit refs #757.

Implemented proposed format.
To do:
* think of shorter syntax for ACLs

Commit refs #757.

- Added parameter to response_add_rrset_*() functions to set
  dname compression case-sensitivity. (Changed API).
- Propagation of the parameter into all affected private functions.
- Changes in nameserver and response-tests to reflect the changed
  API.
- Changed the example zone file to contain domain names differing
  only in case of characters.

refs #776

- If case-sensitive, do not compare just pointers.

refs #776

- Added new API function.

refs #776

- Added parameter to response_add_opt() which determines if the
  max size will be overriden.

refs #769

- OPT RR adding to normal responses.
- OPT RR adding to AXFR. TODO: must somehow enforce larger packets
  than allowed by the OPT RR.
- Stopping AXFR when any error occurs (do not try to send NSEC3s).
- Real size of AXFR packets should not rewrite the buffer size in
  ns_xfr_t.
- Added a lot of debug output.

- Must retain Question section when clearing for AXFR.

fixes #781

- If both max size and OPT RR are given, the payload in the OPT RR
  cannot be larger than the max size - added check.
- Fixed API of response_add_opt().
- Disabled reallocation in response_add_opt() - larger size in OPT
  RR should not override the max size already set (max size is
  more important).

refs #769

refs #755

XFR handler uses event queue for receiving requests.
Each XFR handler thread asynchronously listens for events like UDP handler.

Commit refs #752.

Commit refs #736.

Commit refs #774.

refs #755

- Pointer must be less than 16383.

refs #755

- Size was 'short' which is not enough for 64k packet. Changed
  to size_t to be compatible with the rest of the server.

TODO: there is still some issue with TCP giving more than one
      query to parse.

refs #774

- The file was not compiled at all.
- Had to rename it to dnslib-error.c, as it is impossible to have
  more source files with the same name in the project (Makefile
  issues).

To do:
* XFR handling is synchronous, implement async XFR handler.
* Cleanup in UDP

Commit res #756.

refs #755

- Was replacing the response structure with a new one.

refs #749

Commit refs #756.

- Reused Marek's old code.

refs #755

refs #755