Lots of new figures.
Thin films normal and simple cavity.
Comments regarding energy conservation in Fresnel equations.
Debugged para/perp decomposition matrices.
Corrected rotations of thin films and interfaces.
Added ponentially non-physical two-way mirror.
Test Snell with negative angles, test signed angle between vectors.
init file for networks.
Interface unit test, only geometry for now.
Added an error detection to the solver.
Code to generate figures.