test, add regression to test involutionary character of terms(1)

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'tool/terms'

* tool/terms:
  test, add regression to test involutionary character of terms(1)
chore, kick help2man check from c.ac

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, conditionalise on availability of tcbdb

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'bld/dist'

* bld/dist:
  chore, conditionalise on availability of tcbdb
  chore, kick help2man check from c.ac
hygiene, simplify illegal character warning output routine

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, fadvise() read patterns in co_snarf()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'tool/terms'

* tool/terms:
  hygiene, fadvise() read patterns in co_snarf()
  hygiene, simplify illegal character warning output routine