Fixes crash that appears when journal file is corrupted while
it is lazily opened.

fixes #1871 @30m

Partial core overlap was implemented to prevent stalls and
better utilization of free cores by the scheduler. Not portable.

Improves real-world performance by about 5-10%

Syntax like: 'knotc checkzone example1.com example2.com'

fixes #1229

fixes #1851

For all zones in config file only.

refs #1229

- Knot tried to follow the CNAME chain even if the QTYPE was CNAME.

refs #1868 @1h

- No error returned if the incoming packet has less than 2 bytes.
- Other cases should be handled properly.

refs #1867 @30min

- When returning general error response (i.e. without the
  Question section), the OPCODE and RD bit were not copied.

TODO: handle shorter query wire formats in some cases.

refs #1867 @2h

refs #1384

New config option 'disable-any BOOL;' in 'zones' and 'zone'.

refs #1384

Magic bytes bumped due to checksum algorithm changes.

refs #1840

- The wrapper still needs to be removed and direct call should be used. See #1852

- Magic is now checked before CRC, this should prevent confusion when loading old dumps.

refs 2bfe863d

refs #1833

refs #1833

refs 38859cab

refs #1840

refs #1840 @1h

refs #1835

refs #1835

refs #1348

- Text dump uses FILE pointer again
- fclose is called on stream rather than close in zones.c