ithread priority question...

[Julian Elischer]

In swi_add, the priority is multiplied by PPQ.
This is a layering violation really because PPQ should only be known
within the scheduler.... but..... "Why multiply by PPQ inthe first
place?"  we are not using the system run queues for interrupt threads.

(PPQ = Priorities Per Queue).

Without this you can remove runq.h from proc.h  and include it only in
the scheduler related files.