Synopsis
		sfscatterplot < input.rsf > output.rsf size=80

Input should have three columns (i.e. n2=3): value, x, y (i.e. same as output
of sfsparsify). Essentially a m8r wrapper for Matplotlib's pyplot.scatter. See
http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.scatter
and
http://matplotlib.sourceforge.net/examples/pylab_examples/scatter_star_poly.html

Quick test to check that it works:
sfspike n1=5 n2=3 nsp=3 k1=1,3,4 k2=1,2,3 mag=1,4,2 |sfsparsify nonzero=3 | sfscatterplot

Parameters
		int size=80