updated faulty .csv and debugged fit's

Kennlinien_und_Fitting.ipynb

P-Q_kennlinie_n_1150.csv

P-Q_kennlinie_n_1500.csv

P-Q_kennlinie_n_3600.csv

h-Q_kennlinie_n_3250.csv

h-Q_kennlinie_n_3600.csv

h-Q_kennlinie_n_750.csv