Add a key to graphs, or an option to hide unselected sensors from the list

[GoogleCodeExporter]

What is the expected output? What do you see instead?
On a graph with several values shown in one section (eg. multiple temps), it 
would be handy to have a small key shown, perhaps in a box at the top left. 
Otherwise it can be difficult to distinguish the lines. Failing that, an option 
to hide unused sensors from the list would also suffice.

What version of the product are you using? On what operating system?
0.7.1 Beta on Windows 8.1 64 bit.

Please provide any additional information below.


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Original issue reported on code.google.com by [email protected] on 2 Mar 2015 at 12:08