A test harness for the convolution code in the probe document.  The
runsh script compiles and runs a 3d convolution test producing a
resulting PNG file, which should match the file correct-3d.png.  More
specifically, the command

	run.sh prog

will compile the file prog.c to an executable prog, which is run to
produce an image file prog.png.

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will compile the file prog.c to an executable prog, which is run to
produce an image file prog.png.</div>
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