[Gzz] 9th (jvk)

[Janne Kujala]

9th: Mostly libpaper work

Added "vertex" entry point to PaperPass, allowing
nonlinear custom mapping between object and paper coordinates.

Only simple TexGens are currently supported.

For EmbossTexGen, there are some questions:
        - should we distort the paper or the lighted image of the paper?
        - can I assume that the paper is still flat?
        - how will the application compute the object and paper 
          coordinates -- what kind of derivates (for the local 
          linearization) can be expected to be easily computable?


        jvk