Arc-alkali-rydberg-calculator

This release allows calculation of Winger coefficients for high L values (>50), necessary for example for full-basis calculations of Stark maps for high n states, where maxL>50. See 1027a18ffe376865094de591037111f200c961d1.

**Major changes:**
- added support for small magnetic field along z-axis (Bz, the most common case in experiments)
- fixed error in rounding one of the precalculated coefficients for quadrupole interactions (4579309f65152fa65ca4fc5796eb00d199a4dc39)

**Minor changes:**
- fixed pickling error under Python 3 (622fac22b8be1a497ddf5b40a4c1e8c4a32ecd34)
- fixed few bugs causing with interactive plots sometimes to not respond/appear (c631f88305c84fe6decc3f94d7132d4bd25b3a5c)
- improved graph layout

**Update/installation how-to:**

You can apply the update by deleting data cache from home directory (removing possible wrong numbers saved by previous version)
rm -rf ~/.arc-data
and then by simply installing new ARC version (should see version number 2.0.0 or higher)
pip install ARC-Alkali-Rydberg-Calculator --upgrade --no-cache-dir

Fixes bug 15 that was affecting calculations under Python 3 only (Python 2 was fine). See issue for more details.

You can apply the update by deleting data cache from home directory (removing possible wrong numbers saved by previous version)
rm -rf ~/.arc-data
and then by simply installing new ARC version (should see version number 1.4.5 or higher)
pip install ARC-Alkali-Rydberg-Calculator --upgrade --no-cache-dir

Installation via pip supported on all platforms (Windows included) running Python 2.7 and Python 3.6. Just run pip install ARC-Alkali-Rydberg-Calculator

and you can start using ARC in your Python project simply by

from arc import *

NOTE: Windows installation via pip is a new feature. If you experiance and difficulties or unexpected errors after this installation, please contact developers.

**This version:**
* Improved support for Hydrogen atom calculations.
* Easy installation (Linux and MacOS) via pip pip install ARC-Alkali-Rydberg-Calculator

**Notes for upgrading from old version**
If you have previously installed ARC via pip, use pip uninstall -y ARC-Alkali-Rydberg-Calculator before installing new version via pip.

Please also force ARC into using new database values for Hydrogen by deleting folder with local data with command rm -rf $HOME/.arc-data. ARC globally installed with pip can be directly loaded via from arc import * without specifying details about package location. Upon first loading of ARC, new $HOME/.arc-data folder for data memoization will be automatically created.

Note: If you want to save databases with your own extensive dipole matrix element calculations, make a backup of corresponding .npy files (all except for hydrogen!) **before** deleting and copy into .arc-data folder upon installation of the new version.

***For Windows users***: precompiled Windows package (wheel) is not released at the moment. If you don't know how to do compilation of Python packages, and are not satisfied with old version for Windows (see release 1.3 below) , please contact developers for help!

ARC can be now installed from pip
pip install ARC-Alkali-Rydberg-Calculator