org.el: Honor 'start-level for `org-loop-over-headlines-in-active-region'.

* org.el (org-loop-over-headlines-in-active-region): Fix
docstring.
(org-todo, org-deadline, org-schedule): Honor the 'start-level
value of `org-loop-over-headlines-in-active-region'.

lisp/org.el

@@ -418,9 +418,10 @@ When set to a string, those commands will be performed on the
 matching headlines within the active region.  Such string must be
 a tags/property/todo match as it is used in the agenda tags view.
 
-The list of commands is:
-- `org-schedule'
-- `org-deadline'"
+The list of commands is: `org-schedule', `org-deadline',
+`org-todo', `org-archive-subtree', `org-archive-set-tag' and
+`org-archive-to-archive-sibling'.  The archiving commands skip
+already archived entries."
   :type '(choice (const :tag "Don't loop" nil)
 		 (const :tag "All headlines in active region" t)
 		 (const :tag "In active region, headlines at the same level than the first one" 'start-level)
@@ -11192,12 +11193,13 @@ For calling through lisp, arg is also interpreted in the following way:
                      really is a member of `org-todo-keywords'."
   (interactive "P")
   (if (and (org-region-active-p) org-loop-over-headlines-in-active-region)
-      (let (org-loop-over-headlines-in-active-region)
+      (let ((cl (if (eq org-loop-over-headlines-in-active-region 'start-level)
+		    'region-start-level 'region))
+	    org-loop-over-headlines-in-active-region)
 	(org-map-entries
 	 `(org-todo ,arg)
 	 org-loop-over-headlines-in-active-region
-	 'region
-	 (if (outline-invisible-p) (org-end-of-subtree nil t))))
+	 cl (if (outline-invisible-p) (org-end-of-subtree nil t))))
     (if (equal arg '(16)) (setq arg 'nextset))
     (let ((org-blocker-hook org-blocker-hook)
 	  (case-fold-search nil))
@@ -11950,9 +11952,13 @@ With argument TIME, set the deadline at the corresponding date.  TIME
 can either be an Org date like \"2011-07-24\" or a delta like \"+2d\"."
   (interactive "P")
   (if (and (org-region-active-p) org-loop-over-headlines-in-active-region)
-      (let (org-loop-over-headlines-in-active-region)
+      (let ((cl (if (eq org-loop-over-headlines-in-active-region 'start-level)
+		    'region-start-level 'region))
+	    org-loop-over-headlines-in-active-region)
 	(org-map-entries
-	 `(org-deadline ',remove ,time) org-loop-over-headlines-in-active-region 'region (if (outline-invisible-p) (org-end-of-subtree nil t))))
+	 `(org-deadline ',remove ,time)
+	 org-loop-over-headlines-in-active-region
+	 cl (if (outline-invisible-p) (org-end-of-subtree nil t))))
     (let* ((old-date (org-entry-get nil "DEADLINE"))
 	   (repeater (and old-date
 			  (string-match
@@ -11994,9 +12000,13 @@ With argument TIME, scheduled at the corresponding date.  TIME can
 either be an Org date like \"2011-07-24\" or a delta like \"+2d\"."
   (interactive "P")
   (if (and (org-region-active-p) org-loop-over-headlines-in-active-region)
-      (let (org-loop-over-headlines-in-active-region)
+      (let ((cl (if (eq org-loop-over-headlines-in-active-region 'start-level)
+		    'region-start-level 'region))
+	    org-loop-over-headlines-in-active-region)
 	(org-map-entries
-	 `(org-schedule ',remove ,time) org-loop-over-headlines-in-active-region 'region (if (outline-invisible-p) (org-end-of-subtree nil t))))
+	 `(org-schedule ',remove ,time)
+	 org-loop-over-headlines-in-active-region
+	 cl (if (outline-invisible-p) (org-end-of-subtree nil t))))
     (let* ((old-date (org-entry-get nil "SCHEDULED"))
 	   (repeater (and old-date
 			  (string-match