GXemul Code2

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Converting dev_mp to the new interrupt system, although I have not had time to actually test it yet.

Fixing the JAZZ timer (hardcoding it at 100 Hz, works with NetBSD and it is better than a completely dummy timer as it was before).

Converting Jazz interrupts (PICA61 etc.) to the new interrupt system.

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. :-)