test, provide regression for muxing incompatible sluts

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, use nifty macros from nifty.h

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, translate sluts when muxing ute files with non-compat sluts

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
test, adapt mux.22 regression, new indices go behind old indices on the same timestamp

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, kick ute_add_ticks()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'cmd/mux' into next

* cmd/mux:
  hygiene, kick ute_add_ticks()
  test, adapt mux.22 regression, new indices go behind old indices on the same timestamp
  minor, translate sluts when muxing ute files with non-compat sluts
  hygiene, use nifty macros from nifty.h
  test, provide regression for muxing incompatible sluts