tests/test-gendoc-sv.t

revset: add partial support for ancestor(wdir())

It's easy, so let's make it happen. I'm not certain if 'wdir() &' should
be required. ancestors(wdir()) works without it, but ancestor(wdir()) doesn't
as of now. That's the issue of fullreposet.__contains__() vs __and__().

#require docutils gettext

  $ $TESTDIR/check-gendoc sv
  checking for parse errors