Merge branch 'master' into knotc-improvements

.gitignore

configure.ac

libknot.pc.in

m4/ax_set_version_info.m4

src/Makefile.am

src/knot/common/debug.h

src/knot/common/log.c

src/knot/common/log.h

src/knot/conf/cf-lex.l

src/knot/conf/conf.h

src/knot/ctl/remote.c

src/knot/dnssec/nsec-chain.c

src/knot/dnssec/zone-events.c

src/knot/dnssec/zone-keys.c

src/knot/dnssec/zone-nsec.c

src/knot/dnssec/zone-sign.c

src/knot/nameserver/axfr.c

src/knot/nameserver/internet.c

src/knot/nameserver/ixfr.c

src/knot/nameserver/notify.c