Fix the shared irq problem, by allocating a low priority vector

so that the "high" pri interrupt gets blocked by the "low" spl & irq handler,
and raise the cpl to the "high" level in the handler, so that no other
in fact lower-leveled, interrupts can preempt the handling of the "high"
interrupt.  This means that the "low" interrupt gets the same quality treatment,
thus causing some degradation in performance.  Therefore we still issue a
diagnostic, so people can try to avoid the situation by tweaking their BIOS
settings. Note, there is still issues with dynamically established interrupts
which cause irq sharing, we are working on that.

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