See merge request !313

DNSSEC: Single-Type Signing

See merge request !312

refs #309

Journal fsize

Fixed journal file size / limit arithmetics when the file size was larger than the imposed limits.
Added unit tests for overfill / fillup and file size checks.

See merge request !311

Removed CRC check from journal

See commit fed2e5c2.

See merge request !310

knotc improvements

Improved `knotc` commands + unified and improved help, man and documentation.

- `reload` and `zonestatus` now take arguments and can be called for particular zones
- fixed logging of incoming command (was printing only the last argument)
- fixed use of RCU in remote command processing.
- updated help (`knotc -h`), man page and doxygen documentation
- warning when no arguments are supplied to `refresh -f` and `signzone` (they require at least one argument)
- warning when arguments are passed to `stop` and `checkconf` (they take no arguments)

Fixes #308

See merge request !309

CRC in the journal is replaced by a placeholder to maintain the
journal format.
Removed the zlib dependency.

- libknot-int exports all symbols
- pkg-config is updated to make the change transparent

- Info about command not taking arguments printed to stdout directly.
- Improved error message for missing argument for command.