REL-1394: Uploaded files are now always explicitly marked as unchecked (NGO flag) so that reuploaded files have the flag reset.
REL-1394: Removed extraneous import.
Merge pull request #32 from sraaphorst/feature/REL-1394

REL-1394: Uploaded files are now always explicitly marked as unchecked
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.