remove newline characters from the contents of table cells

This patch changes the functionality of orgtbl-to-orgtbl so that it will
remove newline characters from the text of table cells and replace them
with "\n".  This protects the final table from such newlines.

This patch will probably only have any noticeable effect for tables
imported form external files, or from the results of code blocks.

Best -- Eric

>From 34aacc9aa037e8f17c8d32ed61a25f0a350713a0 Mon Sep 17 00:00:00 2001
From: Eric Schulte <schulte.eric@gmail.com>
Date: Fri, 18 Jun 2010 12:38:26 -0700
Subject: [PATCH] org-table: will now strip newlines from the text of table cells

* lisp/org-table.el (orgtbl-to-generic): added the :remove-newlines
  option which will strip newline characters from the text of table
  cells and replace then with "\n"

  (orgtbl-to-orgtbl): now using the new :remove-newlines option to
  orgtbl-to-generic

lisp/org-table.el

@@ -4119,6 +4119,7 @@ directly by `orgtbl-send-table'.  See manual."
   (let* ((splicep (plist-get params :splice))
 	 (hline (plist-get params :hline))
 	 (remove-nil-linesp (plist-get params :remove-nil-lines))
+	 (remove-newlines (plist-get params :remove-newlines))
 	 (*orgtbl-hline* hline)
 	 (*orgtbl-table* table)
 	 (*orgtbl-sep* (plist-get params :sep))
@@ -4173,9 +4174,13 @@ directly by `orgtbl-send-table'.  See manual."
 	(let ((tend (orgtbl-eval-str (plist-get params :tend))))
 	  (if tend (push tend *orgtbl-rtn*)))))
 
-    (mapconcat 'identity (nreverse (if remove-nil-linesp
-				       (remq nil *orgtbl-rtn*)
-				     *orgtbl-rtn*)) "\n")))
+    (mapconcat (if remove-newlines
+		   (lambda (tend)
+		     (replace-regexp-in-string "[\n\r\t\f]" "\\\\n" tend))
+		 'identity)
+	       (nreverse (if remove-nil-linesp
+			     (remq nil *orgtbl-rtn*)
+			   *orgtbl-rtn*)) "\n")))
 
 (defun orgtbl-to-tsv (table params)
   "Convert the orgtbl-mode table to TAB separated material."
@@ -4301,6 +4306,7 @@ and :tend suppress strings without splicing; they can be set to
 provide ORGTBL directives for the generated table."
   (let* ((params2
 	  (list
+	   :remove-newlines t
 	   :tstart nil :tend nil
 	   :hline "|---"
 	   :sep " | "