Fix SF bug #596434: tweak wordsep_re so "--foo-bar" now splits into /--foo-/bar/ rather than /--/foo-/bar/.  Needed for Optik and Docutils to handle Unix-style command-line options properly.
Fix SF bug #596434: tweak wordsep_re so "--foo-bar" now splits
into /--foo-/bar/ rather than /--/foo-/bar/.  Needed for Optik and
Docutils to handle Unix-style command-line options properly.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator