GXemul Code2

Removing guestoses.html.

Moving remaining modes from unsupported.html into individual machine pages, so that unsupported.html can be removed.

Removing the SGI IP30 and IP32 modes from the new framework; SGI machines are emulated using the old framework.

The guestoses.html page is almost gone.

Removing the QEMU_MIPS machine mode, which was useful back in 2006 to compare performance against QEMU's MIPS emulation.

Adding machine_evbmips documentation.

Adding machine_prep documentation.

Adding machine_pmppc documentation.

Adding machine_mvme88k documentation.

Fix <b> tag.