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

refs #1809

refs #1809

 KNOT -> KNOTD
 DNSLIB -> KNOT

refs #1087 @20m

Removed synchronous zone loading, now fully async.

Commit refs #583.

- Documentation groups now better reflect modules.
- Fixed documentation markers.
- Fixed ifdef guards.

- Sources separated according to the future compilation modules:
  - src/knot/ contains all sources related to server (compiles into
    knotc and knotd)
  - src/alloc/ contains sources of slab allocator (may be compiled
    into standalone library).
  - src/dnslib/ contains dnslib sources (may be compiled as
    standalone library).
  - src/tests/ contains unittests (compiles into unittests).
  - src/zoneparser/ contains sources of zone compiler (compiles
    into knot-zcompile).

TODO: Need to refactor makefile to separate the compilation of
      these modules. However, unittests still depend on all
      modules.

refs #400

Closes #145

Commit refs #53.

Commit refs #53.

* Finally no threading errors or wrong locking orders.
* Updated tests.

Commit refs #53, #50.

This makes dt_resize() and others thread-safe.

Beware though, it is not thread-safe so make sure
you are not in dt_join() while silently killing them.
The Earth might explode in the process.

Bugfixes:
* Enumerations prefixed and ordered