org.el: Allow moving the region by one line up and down.

* org.el (org-move-line-down, org-move-line-up): Remove.
(org-metaup, org-metadown): When the region is active, move it
up/down by one line, with no regard to the context.

lisp/org.el

@@ -18461,6 +18461,15 @@ for more information."
   (interactive "P")
   (cond
    ((run-hook-with-args-until-success 'org-metaup-hook))
+   ((org-region-active-p)
+    (let* ((a (min (region-beginning) (region-end)))
+	   (b (1- (max (region-beginning) (region-end))))
+	   (c (save-excursion (goto-char a)
+			      (move-beginning-of-line 0)))
+	   (d (save-excursion (goto-char a)
+			      (move-end-of-line 0) (point))))
+      (transpose-regions a b c d)
+      (goto-char c)))
    ((org-at-table-p) (org-call-with-arg 'org-table-move-row 'up))
    ((org-at-heading-p) (call-interactively 'org-move-subtree-up))
    ((org-at-item-p) (call-interactively 'org-move-item-up))
@@ -18474,6 +18483,15 @@ commands for more information."
   (interactive "P")
   (cond
    ((run-hook-with-args-until-success 'org-metadown-hook))
+   ((org-region-active-p)
+    (let* ((a (min (region-beginning) (region-end)))
+	   (b (max (region-beginning) (region-end)))
+	   (c (save-excursion (goto-char b)
+			      (move-beginning-of-line 1)))
+	   (d (save-excursion (goto-char b)
+			      (move-end-of-line 1) (1+ (point)))))
+      (transpose-regions a b c d)
+      (goto-char d)))
    ((org-at-table-p) (call-interactively 'org-table-move-row))
    ((org-at-heading-p) (call-interactively 'org-move-subtree-down))
    ((org-at-item-p) (call-interactively 'org-move-item-down))
@@ -20342,32 +20360,6 @@ ones and overrule settings in the other lists."
 	(setq rtn (plist-put rtn p v))))
     rtn))
 
-(defun org-move-line-down (arg)
-  "Move the current line down.  With prefix argument, move it past ARG lines."
-  (interactive "p")
-  (let ((col (current-column))
-	beg end pos)
-    (beginning-of-line 1) (setq beg (point))
-    (beginning-of-line 2) (setq end (point))
-    (beginning-of-line (+ 1 arg))
-    (setq pos (move-marker (make-marker) (point)))
-    (insert (delete-and-extract-region beg end))
-    (goto-char pos)
-    (org-move-to-column col)))
-
-(defun org-move-line-up (arg)
-  "Move the current line up.  With prefix argument, move it past ARG lines."
-  (interactive "p")
-  (let ((col (current-column))
-	beg end pos)
-    (beginning-of-line 1) (setq beg (point))
-    (beginning-of-line 2) (setq end (point))
-    (beginning-of-line (- arg))
-    (setq pos (move-marker (make-marker) (point)))
-    (insert (delete-and-extract-region beg end))
-    (goto-char pos)
-    (org-move-to-column col)))
-
 (defun org-replace-escapes (string table)
   "Replace %-escapes in STRING with values in TABLE.
 TABLE is an association list with keys like \"%a\" and string values.