Extend dired-do-shell-command substitutions

Extend dired-do-shell-command substitutions

Substitute "`?`" inside command with the current file name.
See details in:
https://lists.gnu.org/archive/html/emacs-devel/2017-06/msg00618.html
* lisp/dired-aux.el (dired-quark-subst-regexp, dired-star-subst-regexp):
Mark as obsolete.
(dired-isolated-string-re): New defun.
(dired--star-or-qmark-p): New predicate.
(dired-do-shell-command): Use dired--star-or-qmark-p.  Substitute "`?`"
with the current file name.
* doc/emacs/dired.texi (Shell Commands in Dired): Update manual.
; * etc/NEWS: Mention it.