dname: add output buffer parameters to knot_dname_to_str
dname: add maximal label length constant
dname: unify comment style

Conflicts:
	src/libknot/dname.c
dname: add output buffer parameters to knot_dname_from_str
tests: extend dname tests
dbg: replace knot_dname_to_str with knot_dname_to_str_alloc
Merge branch 'master' into dname_str_params
knotc: removed obsolete argument + updated docs.
man: updated knotc's man
knotc: zonestatus does not support zone param
doc: updated knotc docs.
man: more descriptive info about the flush command.
Merge branch 'knotc-doc' into 'master'

Knotc doc

See merge request !285
zone-events: Split zone events into 3 files

 - events.c: event manipulation API
 - events-impl.c: zone event implementations
 - events-replan.c: event replanning implementations

Closes #262
unittests: fixed include
zone-events: Whitespace removed
zone-events: renamed files
Merge branch 'events-cleanup' into 'master'

Events cleanup

See merge request !286
dname: post review improvements
tests-extra: extended events/soa tests with zone restarts.