Add pivoting to row reduction - #11
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This is a proposed fix for the issue (#10) I filed, where the matrix inverse will silently return
incorrect results if it happens to run across small values while performing row reduction. This fix will work as long for any non-singular matrix: singular matrices may generate an ArithmeticError (division by zero), or just crazy values from inverting floating point numbers very close to zero. This is still far better than the current defective behavior.