Conversion of 0.9.0 to EasyCore/EasyDiffractionLib workflow

[rozyczko]

A major task, that needs to be split into chunks, but smartly.

Unfortunately, the current version relies very heavily on Cryspy-specific datamodel. This needs generalizing and specificity has to be contained to the relevant EasyDiffractionLib Calculator and Interface classes.

We need the ability to create Phases object required by the library
We need the ability to create the Calculator object required by the library
Also, we need the Job object on which profile calculation and fitting will be performed.

Loading of CIF files is already implemented in the Library, so Phases.from_cif_file and Job.from_cif_file have to be reused.

[rozyczko]

Tables.py is really a duplication of the periodictable module, which is already imported in EasyCrystallography, so this needs removal.
Similarly, symmetry info currently read in from Cryspy needs to retrieve the space group details from EasyCrystallography

Unless we decide on using Cryspy as more than just a calculator? If Cryspy provides us with symmetry, CIF read and underlying model representation, this could be a way to simplify the current port.
The obvious price paid is the reliance of other EasyScience projects on a diffraction backend...

[rozyczko]

Alternatively, missing functionality present in cryspy and not in EX/gemmi could be implemented as cryspy - callable methods in EX

[rozyczko]

The new syntax of CIF files will require extensive changes to the EasyCrystallography module.
However, using dots (e.g. _cell.length_a instead of _cell_length_a) seems to be standard from CIF v. 2 (1991). The underscores are treated as an alias name. Then why did we decide on those in the first place?

[rozyczko]

Should we keep having EDA completely calculator-agnostic? If so, all the ED/Cryspy CIF conversion functions should be moved to the library.
However, the library won't be using them, since we didn't do any changes to the way EDL works.

[rozyczko]

Another issue: consider a proper CIF dict parser for files posted on IUCr page, eg,
https://www.iucr.org/__data/iucr/cif/dictionaries/cif_core_3.2.0.dic

especially for aliases