drop files_irods from apps_external

apps/files_external/3rdparty/irodsphp/LICENSE.txt

apps/files_external/3rdparty/irodsphp/prods/doc_config.ini

.../files_external/3rdparty/irodsphp/prods/release_notes.txt

apps/files_external/3rdparty/irodsphp/prods/src/LICENSE.txt

.../files_external/3rdparty/irodsphp/prods/src/Prods.inc.php

..._external/3rdparty/irodsphp/prods/src/ProdsConfig.inc.php

...s_external/3rdparty/irodsphp/prods/src/ProdsDir.class.php

..._external/3rdparty/irodsphp/prods/src/ProdsFile.class.php

..._external/3rdparty/irodsphp/prods/src/ProdsPath.class.php

...external/3rdparty/irodsphp/prods/src/ProdsQuery.class.php

..._external/3rdparty/irodsphp/prods/src/ProdsRule.class.php

...ernal/3rdparty/irodsphp/prods/src/ProdsStreamer.class.php

...xternal/3rdparty/irodsphp/prods/src/ProdsTicket.class.php

...xternal/3rdparty/irodsphp/prods/src/RODSAccount.class.php

...s_external/3rdparty/irodsphp/prods/src/RODSConn.class.php

...nal/3rdparty/irodsphp/prods/src/RODSConnManager.class.php

...ternal/3rdparty/irodsphp/prods/src/RODSDirStats.class.php

...ernal/3rdparty/irodsphp/prods/src/RODSException.class.php

...ernal/3rdparty/irodsphp/prods/src/RODSFileStats.class.php

...nal/3rdparty/irodsphp/prods/src/RODSGenQueConds.class.php