Fix minor text quoting in calc, calendar, vc

* lisp/calc/calc-ext.el (calc-shift-Z-prefix-help):
* lisp/calc/calc-help.el (calc-j-prefix-help):
* lisp/calc/calc-misc.el (calc-help):
* lisp/calc/calc.el (calc-algebraic-mode, calc-mode):
Escape an apostrophe in a docstring.
* lisp/calc/calc-forms.el (calc-hms-notation):
* lisp/calc/calc-mode.el (calc-display-raw, calc-algebraic-mode):
Escape an apostrophe in a diagnostic.
* lisp/calc/calc-misc.el (calc-help):
* lisp/calendar/diary-lib.el (diary-include-files):
* lisp/calendar/todo-mode.el (todo-prefix, todo-item-mark):
* lisp/vc/diff-mode.el (diff-delete-trailing-whitespace):
* lisp/vc/ediff-diff.el (ediff-same-contents):
* lisp/vc/ediff-merg.el (ediff-re-merge):
* lisp/vc/ediff-ptch.el (ediff-patch-file-internal):
* lisp/vc/ediff-util.el (ediff-test-save-region)
(ediff-status-info):
* lisp/vc/ediff.el (ediff-merge-revisions)
(ediff-merge-revisions-with-ancestor):
* lisp/vc/pcvs.el (cvs-mode-checkout, cvs-vc-command-advice):
* lisp/vc/vc-cvs.el (vc-cvs-mode-line-string):
Respect text quoting style in doc string or diagnostic.
* lisp/calc/calc-prog.el (calc-kbd-push, calc-kbd-pop):
* lisp/vc/add-log.el (change-log-goto-source):
Avoid double-formatting.
* lisp/vc/ediff-init.el (format-message):
New backward-compatibility alias.

lisp/vc/diff-mode.el

@@ -2128,7 +2128,8 @@ fixed, visit it in a buffer."
 	(goto-char hunk-end))
       (if modified-buffers
 	  (message "Deleted trailing whitespace from %s."
-		   (mapconcat (lambda (buf) (concat "`" (buffer-name buf) "'"))
+		   (mapconcat (lambda (buf) (format-message
+					     "`%s'" (buffer-name buf)))
 			      modified-buffers ", "))
 	(message "No trailing whitespace to delete.")))))