The positions of 'parent' domain names were not checked before
saving to compression table.

refs #2131 @20m

refs #937

Conflicts:

	src/knot/server/zones.c

refs #2116 @10m

If node is not a delegation point, nor non-authoritative, it
must be explicitly marked as authoritative. This handles the case
when a referral NS RRSet is removed in IXFR/UPDATE.

refs #2116 @30m

fixes #2079 @0.5h

refs #2108 @15m

- Added saving parents of out-of-zone dnames as a pedantic
  compression.
- Pedantic compression enabled by default.

refs #2108 @1.5h

refs #2081 @20m

refs #1497 @15m

refs #2045 @30m

fixes #2023 @1h, refs #2076

- Unknown types lower than TYPE251 could not be used.

fixes #1772 @2.5h

Conflicts:

	src/knot/server/tcp-handler.c
	src/knot/server/xfr-handler.c
	src/knot/server/zones.c
	src/libknot/nameserver/name-server.c
	src/libknot/updates/xfr-in.c
	src/tests/libknot/libknot/response_tests.c

refs #937

refs #2044 @16h

refs #1976

Missing RCU unlock + replaced numbers by error codes.

Conflicts:

	src/knot/server/xfr-handler.c
	src/knot/server/zones.c

Change-Id: Ifc6e02c92b7579f9e3ac84eeb92130ec43a9248b

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

- 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