* lisp/dired.el(dired-get-marked-files): Added two optional args,
`marker-char' and `all-maks'.
(dired-map-over-marks): Added optional arg `all-marks'.
(dired-marker-regexp): Added optional arg `all-marks'.

1) `marker-char'. If non-nil,
the files retrieved are those marked with MARKER-CHAR.
Otherwise the returned files are those marked with
`dired-marker-char'.

2) all-marks, if non-nil, all marked files are returned
regardless of their actual mark (`dired-marker-char' or
a different one).

Callers are not affected: the args are optional and
added at the end of the parameter list.


In GNU Emacs 25.1.50.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.29)
  of 2016-03-03 built on calancha-pc
Repository revision: 887f6126c5ce9084f93083765ac026ca6b28175c