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.

theme/base/config.php

@@ -152,6 +152,12 @@ $THEME->layouts = array(
         'regions' => array(),
         'options' => array('nofooter'=>true, 'nonavbar'=>true, 'nocustommenu'=>true),
     ),
+    // The pagelayout used for reports
+    'report' => array(
+        'file' => 'report.php',
+        'regions' => array('side-pre'),
+        'defaultregion' => 'side-pre',
+    ),
 );
 
 // We don't want the base theme to be shown on the theme selection screen, by setting