changed standard list methods to thread_pq methods
commented out some more mlfbq stuff
Passes priority-sema. Added thread_yield to sema_up
merged with alex-dev to get new locking donation stuffs
priority donate one passes.
Fixed thread_set_priority to also set base_priority. 12 of 18 tests pass now
Now passes 14 cases. Added an owned_locks varible to thread and also a stack which is commented out in functions where it could be used
merged with manny-dev