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   Check whether the supplied data structure is for circular geometry or not. 
   Note:   Not necessary in C++, as overloaded functions with different data 
           structure inputs will be used.
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   Usage:
   a = IsCircGeom( geom );
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   ------
   Inputs
   ------
   geom          (.)   Geometry data structure

   -------
   Outputs
   -------
   a             (1)   Flag (1 if circular geometric struct, 0 if not)   
   
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