Updates are never sent to portico via batch send.

[mauromsl]

There is a model that tracks deposits made to portico via FTP with the batch send command (models.Delivered).

While the check avoids sending redundant data and saves us from traffic it also stops us from sending new deposits when an issue is updated. This is particularly important for publications that have a continuous publication cycle and add articles to an issue after the issue is first published.

• Update the model layer so that an issue can be flagged as requiring an update
• Update the batch_send_to_portico command so that issues flagged as having changed are also sent.