MassStructure:

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   Create a mass data structure.
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   Form:
   m = MassStructure( mass, type, info, cM )
   m = MassStructure( mass, inr, cM )
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   ------
   Inputs
   ------
   mass           (1,1)   Mass
   type           (1,:)   Type of body or (3,3) Inertia matrix
   info           (:,:)   Dimensions depends on type see Inertias
   cM             (3,1)   Center-of-mass location

   -------
   Outputs
   -------
   m              (1,1)   Structure
                          .mass     (1,1) mass
                          .inertia  (3,3) Inertia matrix
                          .cM       (3,1) Center of mass

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Children:

Common: MassProperties/Inertias