drawing of surfaces
raytracing routine debugged part 1 of 2
debugging raytracing routine part 2 of 2
debugging raytracing routine part 2 of 2
debugging raytracing routine part 2 of 2
parsing shape types
parsing shape types
parsing shape types
tidying up function names
model glass added
system setup methods added to OpticalSystem
paraxial pupil calculation function added
started programming pupil aiming method
licensed GPL v2 or later
Merge remote-tracking branch 'mess42/master'

Conflicts:
	material.py
	ray.py