cosmetics, polish strerror(1)'s --help description

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

* bld/dist:
  cosmetics, polish strerror(1)'s --help description
doc, put build status into README.md

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
doc, provide some call examples in README.md

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
doc, provide man page strerror(1)

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

* doc/general:
  doc, provide man page strerror(1)
  doc, provide some call examples in README.md
  doc, put build status into README.md