Arc-alkali-rydberg-calculator

Major release.

Adds support for **divalent atoms** and new methods for working with atom-surface interactions, for modelling ultracold atoms in optical lattices and for calculating valence electron wave functions and dynamic polarisabilities. [Check preprint arxiv:2007.12016 for more details](https://arxiv.org/abs/2007.12016). New [example notebook](https://arc-alkali-rydberg-calculator.readthedocs.io/en/latest/getting_started.html#ipython-notebook-with-examples) is also available.

Fixes installation issue of 2.2.0 (missing refractive_index_data folder 36 ).

This is a new release of a package to allow beta preview and testing of new functionality that arrives with ARC 3.0.0. See 33 and also beta functionality explained in new [documentation](https://arc-alkali-rydberg-calculator.readthedocs.io/en/latest/). Note that you might need to refresh documentation page in web browser to see the latest version of documentation.

This release also changed functions in old ARC code. Nothing should be broken, but if you do experience some new errors when calling old functions that used to work with ARC versions of 2.1.* and earlier, please submit issue.

Minor release that makes installation even easier by doing automatic installation of dependences via pip (see 32 ).

Introduces `arc.advanced` collection of modules that extend basic ARC functionality. Modules are contributed by the research community (and we are looking forward to more contributions!).

The first contribution is by Alessandro Greco, Dipartimento di Fisica “E. Fermi”, Università di Pisa, Italy. He created function `getPopulationLifetime` for calculating population lifetimes in Rydberg manifold and that can be loaded from `arc.advanced.population_lifetime` . See [documentation](https://arc-alkali-rydberg-calculator.readthedocs.io/en/latest/advanced.html) and [readme](/arc/advanced/README.md) for more details

Updates dependencies with Numpy (>=1.16.3) and Scipy so that new versions of libraries can be used (26).