eTraGo works with pypi and is suitable for eGo 0.2.0

• An installation issue when installing from pypi was fixed.
• The random noise function was improved. Now you set a (reproducible) random seed.
• snapshot.weightings are used within the plotting functions
• bug fix for k-means clustering with respect to the aggregation of p_max_pu values of variable generators. They are weighted by their p_nom now.