8.2.4.7} Ellipsoid of Revolution. Code: ELL

      An ELL is a prolate (cigar-shaped) ellipsoid, obtainable by
      revolution of an ellipse around its major axis, and having any
      orientation in space.
      Each ELL is defined by 7 numbers:
      F1_x, F1_y, F1_z, F2_x, F2_y, F2_z, (coordinates of the two foci
      on the major ellipsoid axis), L (full length of the major axis).
      An ELL definition extends over 2 lines in default fixed format, or over
      3 lines in high-accuracy body fixed format.

      Example in default fixed format:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7..
   ELL  003    -400.0       0.0       0.0     400.0       0.0       0.0
                1000.
 * (an ellipsoid obtained by revolution around the x axis of an ellipse
 *  centred at the origin, with major axis parallel to x 1000 cm long and
 *  minor axis 600 cm long).

      The same example in high-accuracy body fixed format:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
   ELL  003                -400.0                   0.0                   0.0
                            400.0                   0.0                   0.0
                            1000.

      The same, in free format:
  ELL   TheCigar   -400.0   0.0   0.0   400.0   0.0   0.0  1000.0

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