GXemul Code2

Beginning to convert the MacPPC GC (Grand Central) interrupt controller to the new interrupt system.

Removing the dummy NetGear machine mode and the 8250 device (which was only used by the NetGear machine).

20070123 Making the testmips mode work with the new interrupt system.
20070127 Beginning to convert DEC5800 devices to devinit, and to the
new interrupt system.
Converting Playstation 2 devices to devinit, and converting
the interrupt system. Also fixing a severe bug: the interrupt
mask register on Playstation 2 is bitwise _toggled_ on writes.

Converting VR41xx (HPCmips) interrupts. NetBSD/hpcmips can be installed using the new interrupt system :-)

Fix; making it easier to use the defines in GXemul.

Various updates. More work on Algor interrupts; they are now working again, well enough to run NetBSD/algor. :-)

20070107 Beginning on the rewrite of Eagle interrupt stuff (PReP, etc).
20070117 Beginning the rewrite of Algor (V3) interrupts (finally
changing dev_v3 into devinit style).
20070118 Removing the "bus" registry concept from machine.h, because
it was practically meaningless.
Continuing on the rewrite of Algor V3 ISA interrupts.

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