dalonsoa/solcore5: Continue polishing Docs and solver

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