bug#22893: 25.1.50; dired-get-marked-files get all marked

[Juri Linkov]

> What about `dired-map-over-marks-check' in dired-aux.el?
> Should we make resemble `dired-map-over-marks' in its
> optional arguments?

Does it make sense to add ALL-MARKS to commands that use
`dired-map-over-marks-check', e.g. to compress or byte-compile
files flagged for deletion?

This also raises the question how do you want to use ALL-MARKS
in bug#22829 to display the number of marked files?  Shouldn't we
display the numbers separately for files flagged for deletion
(helps to see how much space will free up after deletion),
and marked with the default mark (to see whether the total sizes
of marked files will fit to copy to another file partition)?
Or there is not enough screen space in the echo area to display
statistics separately for every used marker-char?