FTAM — FTAM/FTP Issue delete

The FileTransferSession::delete (in File file) operation will have to be changed to accommodate the C++ keyword “delete”. This should be changed to FileTransferSession::delete_file (in File trash). This is in keeping with the style of other operations, e.g. get_file, create_file, etc. The File parameter name should be changed in accordance with an earlier comment.

see above