isis_fance_plots.sl: Add no_reset qualifier to plot_comps

Previously, in the last plotting panel (either the residual or the
main panel), no_reset was set to zero. As a result, no further plots
could be added. Setting the qualifier "no_reset=1" in plot_comps, the
following is now possible:

multiplot([3,1,1]);
plot_comps(1, &plot_data; no_reset=1);
plot_residuals(1; res=1, no_reset=1);
plot_residuals(1; res=3, no_reset=1);

to create a plot with all model components, residuals as chi and as ratio.