Uninline some routines that are just too big to be inlined.
Add some helper macros for SCB ID collision management.
Use a hardware SCB rather than a full SCB for the "next
SCB to queue" sentinal.
Update for new "high SCBID bit" qoutfifo delivery scheme.
If interrupts are disabled on the card, don't bother running
our interrupt handler. Our handler was called due to a shared
interrupt, and the card's interrupts are explicitly disabled
to prevent entry into our interrupt handler.
