Save all oedb turbine_library not only nominal power to file

Author: SabineHaas

doc/whatsnew/v0-2-0.txt

@@ -26,7 +26,7 @@ API changes
 
 Other changes
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-* Restructured csv reading for offline usage of windpowerlib. The nominal power of wind turbines is now saved to a separate file.
+* Restructured csv reading for offline usage of windpowerlib. The nominal power of wind turbines is now saved to a separate file along with other turbine data from the oedb turbine library.
 
 
 Deprecations