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millimeters/nanoseconds/MeV in order to match GEANT4, and also avoid
huge discrepancies in magnitude caused by values like 10e-9 sec.
Along the way, cleaned up a few things:
* Switch the PI and SPEED_OF_LIGHT constants from double to single
precision. This avoid some unnecessary double precision calculations
in the GPU code.
* Fixed a silly problem in the definition of the spherical spiral. Now
the demo detector looks totally awesome. Also wrapped it in a
black surface. Demo detector now has 10055 PMTs.
* Updated the test_ray_intersection data file to reflect the new units.
* Fix a missing import in chroma.gpu.tools
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