chore, import hxdiff from the clitoris suite
chore, make sure tests won't be run in parallel

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
test, provide regressions for enum(1)'s -n|-N

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

* tool/enum:
  test, provide regressions for enum(1)'s -n|-N
  chore, make sure tests won't be run in parallel
  chore, import hxdiff from the clitoris suite
doc, mention enum(1) in README
doc, build and install enum(1) man page

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

* doc/general:
  doc, build and install enum(1) man page
  doc, mention enum(1) in README