#2006 - Add system::mark_file_for_delete API to delete files at shutdown.

- added system::mark_file_for_delete to be called to mark a file
- added system::delete_marked_files to be called at shutdown to delete the list
- amended system::temp_filename to, by default, add the temp name to the list
- updated a few other places in code where this should be used

modules/gallery/controllers/quick.php

@@ -41,7 +41,6 @@ class Quick_Controller extends Controller {
       gallery_graphics::rotate($item->file_path(), $tmpfile, array("degrees" => $degrees), $item);
       $item->set_data_file($tmpfile);
       $item->save();
-      unlink($tmpfile);
     }
 
     if (Input::instance()->get("page_type") == "collection") {