SIZE_STRUCT

       Obtain the size in bytes of an IDL structure definition.

       For most applications this function is superceded by use
       of the /LENGTH keyword to the intrinsic N_TAGS function
       introduced in IDL V2.3.0

                       bytes = size_struct( structure )

                       print, size_struct( "fdq_sdf" )

               structure = a structure variable or
                               a string giving the structure name
                               as known by IDL (help,/struct,variable).
               /PRINT = to print all sub structure sizes.
 inputs/outputs used recursively:
               struct = the structure VARIABLE currently analyzed.
               Max_Field_Size = size of the largest field found in structure.

               Function returns the total size in bytes of a structure element.

               Strategy is to call size_struct recursively if
               structure contains sub-structures.
               Otherwise just add up the field sizes.

       written 1990 Frank Varosi STX @ NASA/GSFC (using align_struct).
       Converted to IDL V5.0   W. Landsman   September 1997

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