Overhaul max/min implementations for Sparse matrices to fix bug #40743. * CSparse.cc (max, min): Declare variables for matrix A, rows and columns, and B, rows and columns. Test A & B sizes and if there is a mismatch check that one of them is not a null matrix before issuing an error. * dSparse.cc (max, min): Declare variables for matrix A, rows and columns, and B, rows and columns. Test A & B sizes and if there is a mismatch check that one of them is not a null matrix before issuing an error.

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