Add PatchesGender fortunes

DTD changes include :—

- Support for `<abbr>`, `<emph>`, `<gap reason="editorial">`, `<note>`,
  and `<ellipsis>` with `<metamark>` and `<supplied>`. Note that
  `<gap reason="editorial">` should be used for ellipses which are not
  present in the original fortune source (while `<ellipsis>` should be
  used for those which _are_.)

- Support for `<emph>` inside of `<seg>`.

- Support for `<date>` inside of `<analytic>`. This is useful for
  articles whose copyright date differs from the publication date of
  the journal issue they belong to.

This commit also improves the linting to ensure that fortunes contain
exactly one `<seg type="callout">`, and makes the make·file ignore lint
errors (so that it does not immediately exit on the first failure).