orgtbl-mode and markdown

[Vegard Vesterheim <vegard.vesterheim@uninett.no>]

I had problems editing tables (using the minor mode orgtbl-mode) in
markdown files. 

To reproduce: 
 - visit an empty buffer in markdown mode
 - M-x orgtbl-mode
 - create a new table (C-c |)
 - try to edit a cell
 - observe that the edited text is misplaced at the end of the line

The following patch against 709bf92950fb3e9dd7425e01eb53eedad43c7262
seems to fix the problem

diff --git a/lisp/org-table.el b/lisp/org-table.el
index acad0bb..188a825 100644
--- a/lisp/org-table.el
+++ b/lisp/org-table.el
@@ -4233,10 +4233,10 @@ overwritten, and the table is not marked as requiring realignment."
 	    t)
 	   (eq N 1)
 	   (looking-at "[^|\n]*  +|"))
-      (let (org-table-may-need-update)
-	(goto-char (1- (match-end 0)))
-	(backward-delete-char 1)
-	(goto-char (match-beginning 0))
+      (let ((org-table-may-need-update) (mb (match-beginning 0)) (me (match-end 0)))
+	(goto-char (1- me))
+	(delete-backward-char 1)
+	(goto-char mb)
 	(self-insert-command N))
     (setq org-table-may-need-update t)
     (let* (orgtbl-mode