Auto delete downloads

[libreliodev]

In order to avoid storage overuse by the app, we want to implement a feature allowing auto download of "old" publications.

This should work as follows:

• a delay for auto deletion will be specified in application_.plist. It will be possible to specify different delays, depending on publication suffix
• when app starts, old publications are deleted

[intrications]

The storage space used and available should be displayed in the app somewhere so the user can keep an eye on the storage used themselves. I would suggest putting this on the Downloads tab.

[libreliodev]

Yes. And maybe we could put it also on the screen displayed while downloading.

By the way, I am not sure, what happens if storage limit is reached while downloading?

[intrications]

There is a bit of code to check how much storage space is left but it isn't used to enforce anything.

Currently the app will probably just stop the download if there is not enough storage left. But the user wouldn't know this and would just think it was broken so this issue is quite important.

So the storage space should also be checked when an issue download starts.

[deepiksdev]

No longer needed.