NAME
        SetTaskPri -- get and set the priority of a task

   SYNOPSIS
        oldPriority = SetTaskPri(task, priority)
        D0-0:8                   A1    D0-0:8

        byte settaskpri(struct task *,long);

   FUNCTION
        This function changes the priority of a task regardless of its
        state.  The old priority of the task is returned.  A reschedule is
        performed, and a context switch may result.

        To change the priority of the currently running task, pass the
        result of FindTask(0); as the task pointer.

   INPUTS
        task - task to be affected
        priority - the new priority for the task

   RESULT
        oldPriority - the tasks previous priority