refs #937 @10m

refs #937 @10m

refs #937 @30m

refs #937 @1.5h

- Storing and applying changesets extracted to zones.c.
- zones_process_update() copy-pasted from normal_query_answer()
  and modified.
- Changed API of changeset storing to be more general.
- ns_prep_update_response() copy-pasted from ns_prep_normal_response()
  and modified.
- response_init_from_query() got new parameter for switching
  Question section copying.

refs #937 @1.5h

refs #1995

Some newer versions of libc exported recvmmsg() symbol,
so it was detected even if the kernel couldn't support it.

refs #1995 @1h30m

refs #937

refs #937 @15m

- Turned assert in zone-load to if-block.
- Added more debug messages to zone-load.
- Added NULL check to knot_rdata_deep_free (possible NULL dereference - rdata->items).

Refs #1877

Refs #1877

Refs #1877

- Moved to separate subsections.

No \code{}.

refs #1877 @5m

refs #1877 @15m

refs #1877

- Replaced by @pxref where applicable

Refs #2002

- IPSECKEY rdata were being parsed in wrong way - two items were stored in one. This caused no problems during responding.
- Changed storing of APL rdata so that it is the same as TXT, currently, it might have caused undesired behaviour with transfered rdata or with rdata loaded from binary.

Closes #2002 @3h

Updated log messages for denied outgoing transfers.

fixes #2007 @3h

refs #1877

refs #1877