Device list should be a table

As discussed with @PolygonalTree the device list should be a table with fields:
`Name,status,time(since in this status),ip,id,...`

At this stage, it would be also good to think of a way to have tick boxes to select several devices in the table. This way, we could, for instance, "start all devices".

The main reason for doing this is that it would allow us to work with many (100+) devices.
