Merge branch 'journal_lmdb_joint' into 'master'

Knot.files

doc/man/kjournalprint.1in

doc/man/knot.conf.5in

doc/man_kjournalprint.rst

doc/operation.rst

doc/reference.rst

src/Makefile.am

src/knot/conf/conf.c

src/knot/conf/conf.h

src/knot/conf/scheme.c

src/knot/conf/scheme.h

src/knot/conf/tools.c

src/knot/ctl/commands.c

src/knot/journal/journal.c

src/knot/journal/journal.h

src/knot/journal/old_journal.c

src/knot/journal/old_journal.h

src/knot/journal/serialization.c

src/knot/journal/serialization.h

src/knot/nameserver/ixfr.c