added ability to specify file for ingest callbacks

includes/ingest.form.inc

@@ -422,6 +422,9 @@ function islandora_ingest_form_execute_consecutive_callback_steps(array $form, a
 function islandora_ingest_form_execute_callback_step(array $form, array &$form_state, array $step) {
   $args = array(&$form_state);
   $args = isset($step['do_function']['args']) ? array_merge($args, $step['do_function']['args']) : $args;
+  if (isset($step['do_function']['file'])) {
+    require_once  DRUPAL_ROOT . '/' . drupal_get_path('module', $step['module']) . "/" . $step['do_function']['file'];
+  }
   call_user_func_array($step['do_function']['function'], $args);
 }
 
@@ -460,6 +463,9 @@ function islandora_ingest_form_undo_consecutive_callback_steps(array $form, arra
 function islandora_ingest_form_undo_callback_step(array $form, array &$form_state, array $step) {
   $args = array(&$form_state);
   $args = isset($step['undo_function']['args']) ? array_merge($args, $step['undo_function']['args']) : $args;
+    if (isset($step['undo_function']['file'])) {
+    require_once  DRUPAL_ROOT . '/' . drupal_get_path('module', $step['module']) . "/" . $step['undo_function']['file'];
+  }
   call_user_func_array($step['undo_function']['function'], $args);
 }