plots don't obey limits

[jgassert]

After running

m_fldaCDM.migrad()
m_fldaCDM.hesse() 

in a Jupyter notebook, the plots of data and fit are automatically displayed, but the fitted line is only plotted over the first and last datapoint. In an unsorted array/list, this gives unexpected plots, not starting from the beginning. A simple addition of min/max calls when plotting would solve this issue.