Batch delete snapshots (or do it in background)

[chillu]

The "delete" action in snapshots relies on submitting a form, which takes up to 30 secs to process and reload a large amount of snapshots (50+). This is exactly the situation where you usually need to start deleting old snapshots, since quotas are exceeded. So if you want to delete 20 snapshots to free up space, that can easily take 10 minutes of sitting there and watching the browser spin. You can work with multiple tabs I guess, but that's hardly ideal.

We need to allow faster deleting of snapshots. Either by submitting the form via ajax, or (preferred) by a new batch edit mode with checkboxes, and a dropdown of the action that needs to be performed.

[stojg]

Is this still an issue with the slightly faster rendering of the snapshot list?