scj: These are changes on core JOP classes. RtThreadImpl is modified sa follows:

- RtThreads are added to the priority ordered linked list only if the register() method is called.
- The CMPHelper object, used as the main thread in a CMP setting is created in ImmortalMemory. Its
run method is executed in a loop that detects mission reinitialization.

The Scheduler is modified so Scheduler objects are no longer created in a static initializer, thus allowing their creation on MissionMemory. The method "createSchedulers()" is package protected and called from RtThreadImpl.init().