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   Create a body.   

   param = CreateBody( 'parameters' ) Lists all parameters
   m     = CreateBody( 'make', 'name', 'thename', val1, ..., paramN, valN )

   Creates the data structure for the body using the parameter pairs
   param1,val1 through paramN,valN. m can be input to BuildCADModel.

   Note that the parameter mass may be a mass structure.

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   Form:
   m = CreateBody( action, type, varargin )
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   ------
   Inputs
   ------
   action         (1,:)   Action 'types', 'parameters', 'make'
   varargin       (:,:)   Parameter pairs

   -------
   Outputs
   -------
   m              (1,1)   Component data structure

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