Merge remote-tracking branch 'origin/master' into rr_refactor

doc/reference.texi

src/knot/conf/cf-lex.l

src/knot/conf/cf-parse.y

src/knot/conf/conf.c

src/knot/conf/extra.c

src/knot/conf/extra.h

src/knot/conf/includes.c

src/knot/conf/includes.h

src/knot/ctl/remote.c

src/knot/nameserver/axfr.c

src/knot/nameserver/internet.c

src/knot/nameserver/ixfr.c

src/knot/nameserver/nsec_proofs.c

src/knot/nameserver/process_query.c

src/knot/nameserver/process_query.h

src/knot/nameserver/update.c

src/knot/server/notify.c

src/knot/server/notify.h

src/knot/server/tcp-handler.c

src/knot/server/xfr-handler.c