Add an option in Edebug to prevent pauses after h', 'f', and o'.

Requested by Paul Pogonyshev.  Also add in documentation for Edebug config
variables which was missing.

* lisp/emacs-lisp/edebug.el (edebug-sit-on-break): New customizable option.
(edebug--display-1): Test edebug-sit-on-break before pausing 1 second.

* doc/lispref/edebug.texi (Jumping): Document the effect of the new option.
(Edebug Options): Document the new option.  Also add documentation for
edebug-eval-macro-args, edebug-print-length, edebug-print-level,
edebug-print-circle, edebug-sit-for-seconds.

* etc/NEWS: Note the new feature.

lisp/emacs-lisp/edebug.el

@@ -233,6 +233,11 @@ If the result is non-nil, then break.  Errors are ignored."
   :type 'number
   :group 'edebug)
 
+(defcustom edebug-sit-on-break t
+  "Whether or not to pause for `edebug-sit-for-seconds' on reaching a break."
+  :type 'boolean
+  :group 'edebug)
+
 ;;; Form spec utilities.
 
 (defun get-edebug-spec (symbol)
@@ -2489,6 +2494,7 @@ MSG is printed after `::::} '."
                 (progn
                   ;; Display result of previous evaluation.
                   (if (and edebug-break
+                           edebug-sit-on-break
                            (not (eq edebug-execution-mode 'Continue-fast)))
                       (sit-for edebug-sit-for-seconds)) ; Show message.
                   (edebug-previous-result)))