[Feature request] Graph-only layout type

[kkofler]

Currently, there are only the following layout types:

• Full view
• No device names
• Big numbers
• One line

In all 4 types, the speed is always shown in numbers. As a result, in a small panel, the graph is mostly covered by text. It would be great to have a "Graph only" option with no text/numbers at all – the numbers should then show (only) in a mouseover tooltip.

If you want to implement RFE #7, this is also pretty much a requirement.