LaTeX export: Preserve line breaks if requested by the user

lisp/ChangeLog

@@ -2,6 +2,8 @@
 
 	* org-latex.el (org-export-latex-fontify): Apply verbatim
 	emphasis.
+	(org-export-latex-make-header): Insert \obeylines if line breaks
+	should be preserved.
 
 	* org-exp.el (org-export-protect-verbatim): Add an
 	`org-verbatim-emph' property to such text.

lisp/org-latex.el

@@ -1007,7 +1007,9 @@ OPT-PLIST is the options plist for current buffer."
 	      (format "\\setcounter{tocdepth}{%s}\n\\tableofcontents\n\\vspace*{1cm}\n"
 		      (min toc (plist-get opt-plist :headline-levels))))
 	     (toc (format "\\setcounter{tocdepth}{%s}\n\\tableofcontents\n\\vspace*{1cm}\n"
-			  (plist-get opt-plist :headline-levels))))))))
+			  (plist-get opt-plist :headline-levels)))))
+     (when (plist-get opt-plist :preserve-breaks)
+       "\\obeylines\n"))))
 
 (defun org-export-latex-first-lines (opt-plist &optional beg end)
   "Export the first lines before first headline.