Plotting utilities

All of the core plotting functions live in the small pl submodule:

cytonormpy.pl.scatter	Scatterplot visualization.
cytonormpy.pl.histogram	Histogram visualization.
cytonormpy.pl.cv_heatmap	Plot a heatmap of cluster CVs for a set of meta‑cluster counts.
cytonormpy.pl.emd	EMD plot visualization.
cytonormpy.pl.mad	MAD plot visualization.
cytonormpy.pl.splineplot	Splineplot visualization.