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* lisp/dired-aux.el (dired-add-entry): Give it a doc-string.
Merge dired-x's dired-omit handling here.
(dired-omit-mode, dired-omit-regexp, dired-omit-localp): Declare.

* lisp/dired-x.el (dired-omit-new-add-entry): Merge into dired-add-entry.

* doc/misc/dired-x.texi (Technical Details): No longer redefines
dired-add-entry.