BUG: While creating the dataset with the AnomalyGenerator

While creating the dataset for the anomaly detection testruns with the AnomalyGenerator I got two unseen bugs:

1. SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame

In the replace in generator/anomaly_generator/utils.py

2. KeyError: 0

while trying to get_value with the Pandas library.

Both were unseen and I got atm no good explanation for them.

I will investigate.