Three small bugfixes

* Remove files from the database even if they couldn't be removed from disk. (log a warning)
* Return a better error message if the user attempts to delete a scheduled file
* Attempt to squash headers already sent warning during buffer flushing
  in FileIO.php

airtime_mvc/application/common/FileIO.php

@@ -61,6 +61,9 @@ class Application_Common_FileIO
         }
         header("Content-Transfer-Encoding: binary");
 
+        //Squashes headers() warning on PHP 5.3/ubuntu 12.04:
+        flush();
+
         //We can have multiple levels of output buffering. Need to
         //keep looping until all have been disabled!!!
         //http://www.php.net/manual/en/function.ob-end-flush.php