Rename session array to be more generic

includes/derivatives.inc

@@ -100,10 +100,10 @@ function islandora_derivative_logging(array $logging_results) {
           drupal_set_message(filter_xss(format_string($message['message'], isset($message['message_sub']) ? $message['message_sub'] : array())), $message['severity']);
         }
         else {
-          if (!isset($_SESSION['islandora_derivative_messages'])) {
-            $_SESSION['islandora_derivative_messages'] = array();
+          if (!isset($_SESSION['islandora_event_messages'])) {
+            $_SESSION['islandora_event_messages'] = array();
           }
-          $_SESSION['islandora_derivative_messages'][] = array(
+          $_SESSION['islandora_event_messages'][] = array(
             'message' => filter_xss(format_string($message['message'], isset($message['message_sub']) ? $message['message_sub'] : array())),
             'severity' => 'status',
           );

includes/utilities.inc

@@ -933,12 +933,12 @@ function islandora_sanitize_input_for_valid_xml($input, $replacement = '') {
  */
 function islandora_event_status() {
   $results = FALSE;
-  if (isset($_SESSION['islandora_derivative_messages'])) {
-    foreach ($_SESSION['islandora_derivative_messages'] as $message) {
+  if (isset($_SESSION['islandora_event_messages'])) {
+    foreach ($_SESSION['islandora_event_messages'] as $message) {
       drupal_set_message($message['message'], $message['severity']);
       $results = TRUE;
     }
-    unset($_SESSION['islandora_derivative_messages']);
+    unset($_SESSION['islandora_event_messages']);
   }
   $text = ($results) ? t('The status messages above will be deleted after viewing this page.') : t('No messages to display.');
   return array('#markup' => $text);