Update some other copyright years automatically, by running:
Run 'UPDATE_COPYRIGHT_YEAR=2019 \
UPDATE_COPYRIGHT_USE_INTERVALS=1 \
UPDATE_COPYRIGHT_MAX_LINE_LENGTH=79 admin/update-copyright'
followed by 'admin/merge-gnulib'.
* lisp/url/url-handlers.el (url-handler-file-name-directory): New
function which handles special cases for `file-name-directory' and
URLs.
* test/lisp/url/url-handlers-test.el: New file. Add tests for
`url-handler-file-name-directory'.