Fix pdf export , make it python3 compatible, Fix markmin2latex import

applications/welcome/views/generic.pdf

@@ -5,7 +5,7 @@ filename = '%s/%s.html' % (request.controller,request.function)
 if os.path.exists(os.path.join(request.folder,'views',filename)):
    html=response.render(filename)
 else:
-   html=BODY(BEAUTIFY(response._vars)).xml()
+   html=BODY(BEAUTIFY(response._vars))
 pass
 =pdf_from_html(html)
 }}