docs: Import 9.2.3 release notes, add news item.
haiku: add swrast driver

* This is pretty small and upkeep should be minimal.
* Currently fully working.
* Cannidate for 10.0.0 branch

Acked-by: Brian Paul <brianp@vmware.com>
docs: fix 9.2.2 -> 9.2.3 typos
docs: fill in md5 checksums for 9.2.3 release
i965: implement blit path for PBO glDrawPixels

This patch implements accelerated path for glDrawPixels from a PBO in
i965. The code follows what intel_pixel_read, intel_pixel_copy,
intel_pixel_bitmap and intel_tex_image are doing. Piglit quick.tests
show no regressions. In my testing on IVB, performance improvement is
huge (about 30x, didn't measure exactly) since generic path goes via
_mesa_unpack_color_span_float, memcpy, extract_float_rgba.

Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>