themes lib MDL-24895 Multiple fixes to better handle overflow.

Major tasks undertaken in this patch:
* New format_text argument, overflowdiv.
* New page layout Report.
* Review of all format_text calls.
* Added support for the report layout to all themes.
* Changed forum post display from tables to divs.

mod/data/index.php

@@ -141,6 +141,6 @@ foreach ($datas as $data) {
 }
 
 echo "<br />";
-echo html_writer::table($table);
+echo html_writer::tag('div', html_writer::table($table), array('class'=>'no-overflow'));
 echo $OUTPUT->footer();