Release v0.1.2 - to be release next week (24th of May) - please check if you have anything to add

[birgits]

• [x] save turbine library from database as csv instead of hdf5 (@SabineHaas)
• [x] kwargs in init of wind turbine, wind farm, wind turbine cluster (@birgits)
• [x] installed power as attribute or getter in wind farm and wind turbine cluster (@birgits)
• [x] document that cluster modelchain / wind farm (for aggregated power curve) requires wind turbines to have power curves (maybe additionally document how to convert power coefficient curve to power curve) (@birgits)
• [x] add deprecation warnings (@birgits)
• [x] check pandas version in setup.py (@birgits)
• [x] add oedb turbine library csv files to repo (@SabineHaas)
• MOVED to v0.2.0: adapt parameter descriptions (now some are links some not or: string <--> str)