refs #2381

norefs

refs #2381

refs #2381

- Added comments to todo()
- Small fixes.

refs #2388

The unittests-libknot content is in unittests now.

- Checking is not parallel as it used to be. Might improve in the future.
- More user friendly error messages from parser.
- Removed some old code.

Add check for exesitence of zscanner test script.

- Coverity: 989601, 989599

- Coverity: 989768, 996156

- Changed usages of this member.
- There still is a theoretical chance of this variable overflowing, but one would need to add more than 64k of RR types to node, *without* merging. With merging, no overflow can occur.
- Fixes #2273

- Coverity: 989769

There is a mess in launching unittests. So libknot unittests are not maintained
and launched as common unittests are. This movement enables some important tests
in the unittests binary instead of unittests-libknot.

TODO: Reduce unittests binaries count.

This is to prevent an attempt to free in xfer task cleanup.

refs #2382