Create a "polished" scanner with saving

[raacampbell]

This version should be closer to a "proper" piece of code, with:

• [x] Input args to set scanning parameters.
• [x] The ability to save
• [x] Nicer figures
• [x] Support for multiple channels

[raacampbell]

I think everything is done. It just needs testing.

[raacampbell]

At this point everything but the multi-channel is working. 5e00900

[raacampbell]

fd08c9a fix multi-channel. seems to work with 4 channels on 6115.