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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 cards in default fixed format, or over
      3 cards 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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