Adds demo for plotting sensors

[neukym]

Starts fixing #78

[neukym]

Looks good @caiw, but there are a couple of issues:

1. The x axis is shrunk
2. The hemisphere are mirrored

Could I leave with you to fix both of these?

[caiw]

Oops yes I'll take a look

[caiw]

1. is because source data latency is in seconds whereas sensor data latency is in milliseconds, and the axis xlims are being set manually to [-200, 800]... @neukym Shall we decide on a standard time unit?

[neukym]

I don't know. Second is the SI unit, but milliseconds is what we use day-to-day, and it always takes me a moment or so to mentally translate "0.045" into 45 milliseconds. I vote milliseconds.

[caiw]

[2. is now fixed]

[caiw]

I don't know. Second is the SI unit, but milliseconds is what we use day-to-day, and it always takes me a moment or so to mentally translate "0.045" into 45 milliseconds. I vote milliseconds.

Yeah I could go either way. I think we should definitely show milliseconds on x-axes, but I can also see an argument for using the SI unit in the datastructure. What does MNE do?

[caiw]

One argument in favour of seconds is that all the .nkg hexel files we currently have use seconds.

[caiw]

Anyway the source of bug (1.) is the different time units on the sensor and hexel .nkg files, not in the code (although manually setting the x-ticks is something we'll have to address eventually when using the next dataset). I suggest we wait until we've decided on a standard time unit and then get the sample datasets all to use that unit and then verify the plots look good before we merge this in.

[caiw]

Thanks for your reviews @neukym! Catching my bugs :)

[caiw]

Done!

[neukym]

Thanks for your reviews @neukym! Catching my bugs :)

The system works! Merging now.

[neukym]

Oh you've merged :-)

[neukym]

Thanks!