Acefile

- Make restoration of mtime/atime on extraction optional, default off, and
add `-r` `--restore` arguments to CLI.
- Parse NT security information from FILE headers when present and optionally
restore file attributes and NT security information on extraction as far as
the platform supports it (issue 4).

- Restore mtime and atime on extraction of files (issue 7).
- Add `-V` `--version` arguments to CLI (issue 8).

- Remove ACE 2.0 PIC mode width multiple of planes restriction (issue 6).
- Improve exception messages and CLI exception handling.
- Add SIGINFO handler to CLI on platforms that support it.
- Add 270 additional ACE archives to corpus of test archives.

- Fix signedness of ACE 2.0 SOUND mode diff calculations (issue 5).
- Add basic debugging facility: `acefile.DEBUG = True` and CLI `--debug`
hidden option.

- 10% performance increase for larger archives by avoiding excessive LZ77
dictionary truncations.
- Improve error handling of acebitstream.BitStream.
- Improve unit test integration and coverage; `setup.py test` now supported.

- Library API: Export open instead of AceArchive on import * from acefile.
- Add high-performance BitStream implementation as optional c extension,
resulting in over 50% speed increase for LZ77 archives.