Merge branch 'master' into zonedb_refactor

README

configure.ac

doc/configuration.texi

doc/installation.texi

doc/knot.texi

doc/reference.texi

man/knot.conf.5.in

samples/knot.full.conf

src/common/descriptor.c

src/common/errcode.c

src/common/errcode.h

src/knot/conf/cf-parse.y

src/knot/conf/conf.c

src/knot/conf/conf.h

src/knot/server/zones.c

src/libknot/dname.h

src/libknot/dnssec/key.c

src/libknot/dnssec/key.h

src/libknot/dnssec/zone-events.c

src/libknot/dnssec/zone-keys.c