1. DEPLOYMENT: Removed outdate datetime grammars.
2. CHANGE: Archive extensions use MD5 for storing IRI data locally.
3. FIXED: Non-determinism in conversion between
          it directory and its segments.
4. ADDED: Home directory predicate.
5. ADDED: Root directory predicate.
6. ENHANCED: relative_file_path/3 now takes file specifications
             and file patterns in addition to atomic file names.