change reading group csv output to use team colours for heading

booking.studygroups_report.inc

@@ -68,8 +68,13 @@ function booking_studygroups_csv_report($group_id) {
   foreach ($header_array as $column) {
     $maximums[] = count($data[$column]);
     //make the column headings a bit more user friendly
+    if ($group->booking_is_readinggroup == 'Y') {
+      $column_headings[] = _booking_readinggroup_colour_lookup($column);
+    }
+    else {
       $column_headings[] = "Session " . $column;
     }
+  }
   
   //add the column headings to the CSV 
   $header = implode( $delimiter, $column_headings );