1. We went back to completing our commands during the interrupt for
performance reasons.
2. Added the 7895_irq_hack boot option to deal with broken Tyan Thunder II
motherboards. This only applies for BIOS version < 1.16 on the Tyan
Thunder II motherboard. It has a bug dealing with the IRQ setup on
the 7895 controller. This option may go away in the future.
3. Cleanups to the README.aic7xxx file.