REL-1436: Fix compareTo method of Alloc objects.
REL-1436: Changed Alloc from being an interval to using an interval.
REL-1436: Remove some obsolete code.
REL-1436: Block uses intervals instead of being one; Block and Interval implement common interface.
REL-1436: Quick code cleanup.
Merge pull request #8 from fnussber/feature/REL-1436

REL-1436, REL-615: QPT bug fixes caused by faulty comparison of Alloc objects.