plot suppdata with appropriate range

[sophiatibblin]

The range of the subplot when suppdata is provided is set to -0.5 to 0.5 by default

peakdet/peakdet/editor.py

Line 121 in e99c705

if self.suppdata is not None:

It would be appropriate that the range is actually set according to the data (by some factor), such as np.min(phys_01.suppdata) and np.max(phys_01.suppdata)