knotc: reloading individual zones
knotc: Updated documentation (reload)
knotc: Warning to log if zone is not found.
knotc: Error on bogus arguments
knotc: zonestatus <zone> + RCU fixes

- Allowed the command zonestatus to take zone names as arguments.
- Optimised code of flush.
- Added missing RCU locks and reorganised a little bit.
- Updated documentation and help.
knotc: Updated doxygen + man + help
knotc: Updated and unified man, help and doc
knotc: Improved error messages.

- Info about command not taking arguments printed to stdout directly.
- Improved error message for missing argument for command.
Merge branch 'master' into knotc-improvements
knotc: Missing RCU
autoconf: compatibility with old pkg-config
Merge branch 'master' into knotc-improvements
tests: replace strcpy with strlcpy
net: fix unused flag if not freebind
fix distcheck
configure: detect sphinx-build on Fedora
knotc: tune help message + fix long options
doc: remove knotd/c help and reorganize Running section
man: update knotc and knotd pages
journal: Removed CRC check.

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