Rewrote interrupt code to handle masking correctly and changed every

Rewrote interrupt code to handle masking correctly and changed every
interrupt to use a different subnumber since both devices could
interrupt at the same time and we don't want to loose one.

dev/tsunami_cchip.cc:
    rewrote interrupt code to handle interrupt mask clearing correctly
dev/tsunami_cchip.hh:
    changed (post/clear)DRIR to use a interrupt number rather than a vecotr
dev/tsunami_io.cc:
    updated for new post/clearDRIR calls

--HG--
extra : convert_revision : 5b39f5e15a66d5eb6e689e6ece62f99b5fa735ab