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Last-ditch maximum size limit for Net

This makes sure that width * height <= INT_MAX, which it rather needs
to be.

--- a/net.c

+++ b/net.c

@@ -7,6 +7,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -313,6 +314,8 @@

 	return "Width and height must both be greater than zero";

     if (params->width <= 1 && params->height <= 1)

 	return "At least one of width and height must be greater than one";

+    if (params->width > INT_MAX / params->height)

+        return "Width times height must not be unreasonably large";

     if (params->barrier_probability < 0)

 	return "Barrier probability may not be negative";

     if (params->barrier_probability > 1)