Expand terrain-pocket.png and terrain.png to 1024 textures (32x32)
Submodule pymclevel updated.

Submodule pymclevel:
    > c5c5738 - 0.8.0build5
    > 4a83a3d - Texture update for 0.8.0
More hacky changes to texture coordinates, to allow 1024-slot texture sheets.