Manpages of src:dh-octave in Debian stretch-backports

• dh_octave_changelogs(1)
• dh_octave_check(1)
• dh_octave_clean(1)
• dh_octave_examples(1)
• dh_octave_make(1)
• dh_octave_substvar(1)
• dh_octave_version(1)