More dired-x cleanup.
* lisp/dired-x.el (dired-clean-up-after-deletion): kill-buffer does not need save-excursion. (dired-do-run-mail): Doc fix. (dired-filename-at-point): Doc fix. Use looking-at, and skip-chars rather than re search. (skip-chars were used prior to 2003-01-27T11:36:08Zfirstname.lastname@example.org, and are ok to use again since Emacs 22.1, because char-classes are supported.)
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