Journal: re-implemented completely, LMDB, all zones in one db

Knot.files

doc/man/knot.conf.5in

doc/reference.rst

src/Makefile.am

src/knot/conf/conf.c

src/knot/conf/conf.h

src/knot/conf/scheme.c

src/knot/conf/tools.c

src/knot/ctl/commands.c

src/knot/journal/journal.c

src/knot/journal/journal.h

src/knot/journal/serialization.c

src/knot/journal/serialization.h

src/knot/nameserver/ixfr.c

src/knot/server/journal.c

src/knot/server/journal.h

src/knot/server/server.c

src/knot/server/server.h

src/knot/updates/changesets.h

src/knot/zone/zone-load.c