Added normals to show field.

Still don't have appropriate shaders for the field.
Minor prettifications to inner VBO loop.
Various refactoring.

This file is in serious need of cleanup.
Refactoring ShowFieldModule.

Also added a test network for visualizing a lattice volume.
More refactoring: specializing IBO creation.

Also preparing to add normal shaders.
Added directional phong shader.
Update directional light source.

Also fix incorrect usage of geometry object API.
Added field visualization example.

Also fixed namespace issue.
Refactor the building of edge IBOs.
Refactor node IBO function.
Removing reference code.
Changed position of normal within structure.

Object now lights correctly. There is a unit test here...
Avoiding neon-green.