TreeBldCAD

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   Take the CAD data and create the body array for Tree.
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   Form:
   x = TreeBldCAD( g, s, spring )
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   Input
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   g               (:)   Spacecraft data structure generated by Build3DSC
   s               (:)  .w    (3,1) or (1,1) Rate
                        .q    (4,1) or (1,1) Attitude
   spring          (:)  .k    (3,3) Data structure General stiffness matrix
                        .c    (3,3) Data structure General damping matrix

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   Output
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   x               (:,:) Data structure

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