Arc-alkali-rydberg-calculator

This is version 1.1rc of ARC.

**Recommended installation** is done by downloading below correct pre-compiled package for Windows, Mac or Linux 64-bit machines.

**Advanced** Linux and Mac users can also download the source, and compile C extension, following [Installation instructions](http://arc-alkali-rydberg-calculator.readthedocs.io/en/latest/installation.html#compiling-c-extension). For Windows users, we recommend using pre-compiled binary provided below. Please contact ARC developers if you have problems with that.

Several minor bug U/I fixes, updated Hydrogen class, updated and expanded precalculated databases. Now ships with C instead of C++ code for optimal Numerov calculation, reducing dependencies.

Compiled C++ Numerov calculation now has permission to be executed (chmod 774). This release also corrects issue 1 - now the package contains arc/temp/ folder that allows C++ implementation of Numerov to run without problems.