A faulty optical process can make the position or direction of the

photon into NaN on the GPU.  Now we abort these photons rather than
let them lock up the intersect_mesh() method.  There is a new history
bit (#31) that indicates when a NAN_ABORT has occurred, and this bit
is checked for by GPU.propagate().  If set for any of the photons, a
warning message is printed.

While not as good as preventing the NaN problem in the first place,
this at least ensures we are aware of the problem.

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