ComplexToReal:

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   Convert a matrix from complex to real. c is assumed to have columns of
   complex conjugates next to each other. 
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   Form:
   [r, t] = ComplexToReal( c )
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   ------
   Inputs
   ------
   c              (n,m)       Square complex matrix

   -------
   Outputs
   -------
   r              (n,m)       Square real matrix
   t              (m,m)       Transformation matrix.

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   Reference: Andry, A. N., Jr., Shapiro, E.Y. and J.C. Chung, 
              "Eigenstructure Assignment for Linear Systems," IEEE 
              Transactions on Aerospace and Electronic Systems,
              Vol. AES-19, No. 5. September 1983.
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