* Enhance dired to allow specification of a list of files in a

* Enhance dired to allow specification of a list of files in a
  specific directory in place of a directory.

* Change OS-specific code for dired to be a single entry point,
  INSERT-DIRECTORY!, that can insert the listing for a single file, a
  whole directory, or a wildcarded expression.

* Add new procedure, FOR-EACH-DIRED-MARK, that maps a procedure over
  the marked files in a dired buffer, and unmarks each file as it is
  processed.