refs #1976

refs #1976

refs #1927 @1h

TODO: setting when loading zone from config.

refs #1132 @5m

- Also added NSD's BSD license text to descriptor.c/.h

@1h

 KNOT -> KNOTD
 DNSLIB -> KNOT

refs #1087 @20m

refs #1087

refs #1056 @5m

refs #1056 @5m

refs #999 @5m

closes #999 @15m

refs #994 @5m

refs #994 @30m

- Added zone_get_apex().
- Fixed node_set_previous(), node_set_nsec3().

refs #995 @15m

- Getting previous node (non-const) from node.
- A lot of fixes of zone tree, changed some return values, etc.
- Simplified zone_new() + added zone trees to zone.

refs #994 @40m

Journal settings respects config.

Commit refs #975.

dnslib_zone_t contains "void *data" and destructor function.
Zone-specific data is represented by "zonedata_t" in "zones.h".

Commit fixes #921.

- Some usages still remain, they would require more systematic
  changes.

refs #1056 @2h

- Added zone-contents module, most of zone functions moved there
  and adequately modified.
- Zone API functions just call the zone-contents functions now.
  Later should be removed totally.

- Few fixes.

refs #1028 @2h

refs #936 @1h30m

- This will allow easy switching of the zone contents inside
  the zone structure, instead of switching the pointer to the
  zone somewhere in zonedb structures.
- Changed all uses of zone, removed some direct uses and replaced
  by uses of API.
- First parts of xfrin_apply_changesets().

refs #936 @1h30m

refs #999 @5m

closes #999 @15m

refs #994 @5m

refs #994 @30m

- Added zone_get_apex().
- Fixed node_set_previous(), node_set_nsec3().

refs #995 @15m

- Getting previous node (non-const) from node.
- A lot of fixes of zone tree, changed some return values, etc.
- Simplified zone_new() + added zone trees to zone.

refs #994 @40m