Update reblock plots for newer pandas versions. Use subplots instead of multiple y axes.
Update reblock plots for newer pandas versions. Use subplots instead of multiple y axes.

Pandas API changes broke (some time ago) the indexing into the
DataFrame. Fix by using correct API.

The use pf multiple y-axes for each data series didn't scale (and is
fragile for large numbers of series). Switch to using subplots instead.

hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande