Open questions for the plotting of t_potdem variables:
- Do we put the plotting of the mixed density with and without core back in?
- Do we put inDen with no core charge in?
- Do we put vCoul and vXc in?
- Warnings for iplot/=0 but no plot tag (e.g. Hey. Do you really wanna plot or not?), polar only with noco and vecPlot only with noco?