Merge branch 'master' into wildcard_child2

src/common/hattrie/hat-trie.c

src/common/hattrie/hat-trie.h

src/common/mempool.c

src/knot/dnssec/nsec3-chain.c

src/knot/dnssec/zone-nsec.c

src/knot/dnssec/zone-sign.c

src/knot/nameserver/axfr.c

src/knot/zone/zone-contents.c

src/knot/zone/zone-diff.c

src/knot/zone/zone-tree.c

src/knot/zone/zone-tree.h