windpowerlib: A python library to model wind power plants (v0.1.0)

The first single zero release equips the windpowerlib with a large amount of new functionalities. A major change is the modelling of wind farms where wake losses can be taken into account by a wind farm efficiency or by reducing wind speeds. Moreover, the option of modelling wind turbine clusters, including aggregated power curves, is useful for combined modelling of all wind turbines in a weather data grid cell. Furthermore, the spatial distribution of wind speeds can be considered by using the new power curve smoothing functionality. Apart from that, the windpowerlib is now connected to the OpenEnergy Database which provides it with power (coefficient) curves.