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   Convert an inertia matrix in the form [Ixx Iyy Izz Ixy Ixz Iyz]
   to 

   [Ixx Ixy Ixz
    Ixy Iyy Iyz
    Ixz Iyz Izz]

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   Form:
   y = IC623X3( x )
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   ------
   Inputs
   ------
   x           (1,6)     [Ixx Iyy Izz Ixy Ixz Iyz]

   -------
   Outputs
   -------
   y           (3,3)     Inertia matrix

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   Copyright (c) 1995 Princeton Satellite Systems, Inc.
   All rights reserved.
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