#11 Add Detailed Texture Maps to 3D View

[Joseph A. Huwaldt]

Add the ability to do "detailed" texture maps in the 3D view. My
current plan is to have high resolution detailed texture maps for
regions near the view point and to use an overall low res texture
map for regions far from the view point. Then the detailed
textures near the view point can be cached and fed to the graphics
card as needed. Many details need to be worked out.