Implement Data Preparation

Design idea: "Data from different sources is collected"

DataPreparation can handle data from a different source. Returned data is ready to use. Identifier is station ID of station of interest. DataPreparation can make use of a single (or multiple) StationPreparation classes (and maybe one day of a MapPreparation for field data?). Data is combined and returned as a ready-to-use list of X and Y.

Jobs:

• has methods get_X, get_Y, get_data (returns X, Y)
• calls method preprocess to trigger all required preprocessing steps
• store data
• find / use neighborhood (or corresponding grid data)
• upsampling of X according to Y of station of interest
• ... ?
• return X, Y of all data sources as lists of matrices