These are irrelevant because the fnmatch module implementation already
uses functools.lru_cache.

Use a unified script, to reduce code duplication and in preparation
for doing a similar thing with styles and filters.  The new script
also uses a bit more modern Python APIs (e.g., pathlib).

Unlike the previous scripts, it does not replace replace CRLF with LF
because Git should do that itself.

* Fix #632.

The doc string indicates that the linenos table is wrapped in <div class="highlight">,
but the actual implementation puts the <div> inside the table cell containing the code.
This seems to cause issues as explained in #632, and given it doesn't match the
documentation, this PR restores the original behavior.

* Fix sample code in comment.

* Update CHANGES.

* Refactor the wrapping logic.

Instead of calling _wrap_div() at the end of wrap(), _wrap_div()
is now called after wrap/_wrap_tablinelinenos. This yields the
desired behavior but removes the custom <div> generation code.

the generated anchor links should be `#foo-42` and not `#-42`.