Merge branch 'code-cleanup' into 'master'

Knot.files

src/Makefile.am

src/common-knot/slab/alloc-common.h

src/common-knot/slab/slab.c

src/common-knot/slab/slab.h

src/knot/zone/events/events.c

src/knot/zone/events/events.h

src/knot/zone/events/replan.c

src/knot/zone/events/replan.h

src/zscanner/scanner.c.g2

src/zscanner/scanner.c.t0

src/zscanner/scanner.rl

tests/.gitignore

tests/Makefile.am