Basic SDL stuff

Some wierd bug where the cords get messed up near the end of the array.
Photon visualization

Press space to advance path, scale is preset.
Todo: compute scale dynamically while advancing path; add keys for
changing viewpoint on the fly (front, side and top-down).
Possibly look into ways of exporting image files.
Saved Project
Dynamic scale

Scale changes dynamically
Saved project
Uncommited changes

All small details, not sure why they weren't commited.
Fixed major bug

Photons were never entering layers that were above it, neither were they
ever reflecting out through the air/tissue boundary.
Also did some cleaning up and work on the photon visualizer.
F1 - F3 to change views, backspace to go backwards.
Saved project

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