* lisp/dired.el (dired-dwim-target): Add choices
dired-dwim-target-next and dired-dwim-target-recent.
* lisp/dired-aux.el (dired-dwim-target-next)
(dired-dwim-target-recent): New functions.
(dired-dwim-target-directories): Call either of them.
* doc/emacs/dired.texi (Operating on Files): Mention new
preferences in dired-dwim-target.