Merge commit 'origin/gallium-0.1' into gallium-0.2

Merge commit 'origin/gallium-0.1' into gallium-0.2

* commit 'origin/gallium-0.1':
  Mesa: fix number of buffers in st_draw_vbo().
  Nouveau: fix nv20_vertex_layout()
  Nouveau: update nv20 miptree according to nv40.
  Nouveau: build, link and use nv20.
  Nouveau: name replace for nv20.
  Nouveau: Rename nv20/ files as nv20.
  Nouveau: copy nv30_vertprog.c to nv20.
  Nouveau: start nv20 by copying the nv10 tree.