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11. Generic infinite half-space. Code: PLA

      Each PLA is defined by 6 numbers:
      H_x, H_y, H_z (x, y and z components of a vector of arbitrary length
      perpendicular to the plane), V_x, V_y, V_z (coordinates of any point
      lying on the plane).
      The half-space "inside the body" is that from which the vector is pointing
      (i.e., the vector points "outside").
      A PLA definition extends over a single card in default fixed format, and
      over two cards in high-accuracy body fixed format.

      Example in default fixed format:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7..
PLA 74 0.0 1.0 1.0 200.0 -300.0 240.0
* (all points "below" a plane at 45 degrees in the y-z projection which
* passes through the point x=200, y=-300, z=240 - note that for such a
* plane the x value of the point is completely irrelevant - )
The same example in high-accuracy body fixed format:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
PLA 74 0.0 1.0 1.0 200.0 -300.0 240.0 The same example in free format: PLA tiltPla 0.0 1.0 1.0 200.0 -300.0 240.0

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