Solcore

- Solcore has been added to Pypi and can now be installed with pip install solcore
- New installer including the compilation of extension modules
- New documentation about installing Solcore, specially under Windows

- Corrected errors in tests and examples.

- Improvements in the quantum solver
- Added plot generation for LDOS
- Corrected an error in the parameters for InP
- Implemented parametric tunnel junction model
- Added support for external tunnel junction IV characteristics
- Improved external optics option
- Added optical properties for GaAsP, GaInP and AlInP, although with just 2 or three-point interpolation
- Started a simple tutorial
- Polished the PDD solver and separated the preparation of the solar cell from the optical solvers
- Material system updated with new properties, and other minor changes
- Radiative recombination coefficient for PDD is calculated from the absorption coefficient
- Improvements in the tunnel junction and the plotting of wavefunctions
- The TMM solver has been vectorized and built directly into Solcore.

- A new SolarCell class has been implemented to create solar cell structures, including not only the junctions but also optical layers.
- All solar cell solvers have been re-written in order to use a common interface - the SolarCell class.
- The calculation of the optical properties of a solar cell has been externalized. Added a transfer matrix algorithm and an interface for the S4 RCWA package.
- Materials in the SOPRA database can now ve imported as normal Solcore materials.
- Added the Modified_CPPB module to the absorption_calculator package.
- The Solcore materials now use, automatically, the mobility calculator if available for that material.

- Mobility calculator and data moved to the material_data package

- Created the class LightSource as a common interface to all types of light sources.
- solar_spectrum package renamed light_source
- Other Solcore packages adapted to use LightSource, while keeping as much backwards compatibility as possible.