Layout improvements. Change default inner padding for html_frame_start() from 5 to 0, this

lets us eliminate the white spacing between frames and their contents. Add in a
div.default_container class that has a 5px padding to replace the now not present default
spacing.

apidb.css

@@ -220,6 +220,9 @@ TD.app_name { width: 150px }
 /* Note box */
 .note { padding: 7px; }
 
+/* Default div style */
+div.default_container { padding: 5px; }
+
 /*******************************************************************/
 /* Specific elements                                               */
 /*******************************************************************/