Possiblility of EEASiSSS backend

[Liam-Deacon]

It is worth seeking the possibility of including John Rundgren's EEASiSSS phase shift program as a backend to the phaseshifts package.

1. Contact John Rundgren about including EEASiSSS
2. Reimplement phaseshifts internals to allow multiple backends (depends on 1)
3. Add EEASiSSS as phase shift calculation backend (depends on 2)
4. Add Documentation (depends on 3)

Related

• Add EEASiSSS to list of alternatives #90

[Liam-Deacon]

Note this was initiated a long time ago with John Rundgren himself whilst I was working at Diamond Light Source. The code was never finalised however, but remains on the develop branch.

I have started reworking the feature ready for inclusion into master under #94 but there is significant divergence and best practice considerations (such as testing) to account for before it is ready.