MAJOR: Implemented FileSystemActionComparator and FileSystemActionComparatorTest, fix AllFilePossibilitiesTest (added more ChangeType*-tests, now finishes without error, woww); MINOR: rename FileVersionHelper to FileVersionComparator, fix don't create DELETED files in FileVersionComparator, extract sortFileSystemActions in DownOperation, added Windows capitalization test (behavior not implemented yet), alter framework.*-tests to make them deterministic