GXemul Code2

Show more verbose boot messages, those starting with an exclamation mark, when attempting to boot irix kernels.

Update to match my real O2.

Removing paragraph about things that do not work. They still do not work but mentioning that everywhere seems superfluous.

Some preliminary release notes.

More work on the O2 rendering engine Raster Ops. Moving windows within NetBSDs X11 now looks as it should.

Updating the TODO.

Silence the register 23 warning for now.

Implementing host X11 mouse input for the pckbc device.

Progress on PS/2 mouse emulation; NetBSD accepts it as "pms0 at macekbc0" in the SGI O2 emulation mode. (No actual host mouse input yet though.)

Splitting SGI O2 rectangle drawing and line drawing into separate parts; NetBSD/sgimips Xorg now looks reasonable.