Integrating some of LiberTEM features

[CSSFrancis]

Is your feature request related to a problem? Please describe.
LiberTEM has a lot of features which pyxem has been lacking such as SSB Pyctography. It might be very useful to integrate or at least create a workflow which either:

1. Lightly wraps the LiberTEM functions allowing people to download LiberTEM as an optional dependency for those operations.
2. Provide notebooks showing how to translate the data from one source to the next.

As both packages have pretty similar dask based workflows this should add significant new features with little work and gives a bit more continuity between workflows.

Describe the solution you'd like

I'm open to suggestions from people as to the best way to do this. Particularly @uellue if you have any insight into the best way to do this I would love some suggestions!

It seems like LiberTEM has lots of functionality where pyxem is lacking so some collaboration would be useful!

[CSSFrancis]

@nhagopian You have been using both packages a little bit interchangeably so any insight you have would be useful.

[pc494]

@CSSFrancis - This is probably a post 1.0.0 job isn't it?

[CSSFrancis]

@pc494 Yes, I also think it would probably be better to have this as an tutorial rather than a new feature