8.2.4.1} Rectangular Parallelepiped. Code: RPP

      An RPP has its edges parallel to the coordinate axes.
      It is defined by 6 numbers in the following order:
      X_min, X_max, Y_min, Y_max, Z_min, Z_max (minimum and maximum
      coordinates which bound the parallelepiped).
      Warning! Of course X_min must be < X_max, Y_min < Y_max and Z_min < Z_max.
      If this condition is not satisfied, the body is ignored.
      An RPP definition extends over one single line in default fixed format,
      or over two lines in high-accuracy body fixed format (IDBG = -10 or -100
      in the CG Title line, see above).

      Example in default fixed format (the comment lines shown are allowed input
      lines):
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7..
   RPP    4     -20.0     +20.0     -50.0     +50.0     -38.5     +38.5
 * (a parallelepiped centred on the origin)

      The same input, in high-accuracy fixed format, would be:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
   RPP    4                 -20.0                 +20.0                 -50.0
                            +50.0                 -38.5                 +38.5

      The same, in free format:
 RPP Smlbrick  -20.0  +20.0  -50.0  +50.0  -38.5  +38.5

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