Fixed changesets compatibility issues.

src/knot/conf/conf.c

src/knot/zone/zone-load.c

src/libknot/dnssec/zone-events.c

src/libknot/dnssec/zone-nsec.c

src/libknot/dnssec/zone-sign.c

src/libknot/updates/changesets.c

src/libknot/updates/changesets.h

src/libknot/zone/zone-contents.c

src/libknot/zone/zone-diff.c