params_plot_img_with_bg() now makes calculations that would be executed every time a slice is computed and saves the results in a dictionary which are then read by plot_vstc_grid_slice()
params_plot_img_with_bg() now makes calculations that would be executed
every time a slice is computed and saves the results in a dictionary
which are then read by plot_vstc_grid_slice()

fboers/jumeg,pravsripad/jumeg,jdammers/jumeg