test, add regressions for the redir output file case

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, introduce filenames for bits as well and pass them on to the diff util

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, use ctors for overloaded clit_bits

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, parse < FILE comparison commands

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
test, adapt < FILE regression tests to something that actually doesn't change

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'feat/file-cmp'

* feat/file-cmp:
  test, adapt < FILE regression tests to something that actually doesn't change
  minor, parse < FILE comparison commands
  hygiene, use ctors for overloaded clit_bits
  minor, introduce filenames for bits as well and pass them on to the diff util
  test, add regressions for the redir output file case