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Inversion results for a (6,6) matrix
For each inversion procedure we check the maximum size  
of the off-diagonal elements of Inv(A) * A              
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1. Use .InvertFast(&det)
  Maximum off-diagonal = 0.000169822
  Determinant          = 5.36729e-18
2. Use .Invert(&det)
  Maximum off-diagonal = 1.16415e-10
  Determinant          = 5.3673e-18
3. Use TDecompLU
  Maximum off-diagonal = 5.09317e-10
  Determinant          = 5.3673e-18
4. Use TDecompSVD on non-square matrix
  Maximum off-diagonal = 9.09495e-12
  Determinant          = 1.34646e-11