Removed -march switch on Mac gcc 4.2.1 and correctly set OpenMP settings.

CMakeLists.txt

MathLib/LinAlg/Solvers/CGParallel.cpp

MathLib/LinAlg/Sparse/CRSMatrixDiagPrecond.h

MathLib/LinAlg/Sparse/amuxCRS.cpp

MathLib/MathTools.h

SimpleTests/MatrixTests/MatMult.cpp

SimpleTests/SolverTests/BiCGStabDiagPrecond.cpp

...s/SolverTests/ConjugateGradientDiagonalPreconditioned.cpp

...leTests/SolverTests/ConjugateGradientUnpreconditioned.cpp