unpack archive files in Python

Features:

- unpack archive files
- support passwords
- very simple interface
- command line interface and library

back-ends:

- zipfile: included in Python
- patool: It relies on helper applications to handle those archive formats (for
  example bzip2 for BZIP2 archives). Supported formats: 7z (.7z), ACE (.ace),
  ALZIP (.alz), AR (.a), ARC (.arc), ARJ (.arj), BZIP2 (.bz2), CAB (.cab),
  compress (.Z), CPIO (.cpio), DEB (.deb), DMS (.dms), GZIP (.gz), LRZIP (.lrz),
  LZH (.lha, .lzh), LZIP (.lz), LZMA (.lzma), LZOP (.lzo), RPM (.rpm),
  RAR (.rar), RZIP (.rz), TAR (.tar), XZ (.xz), ZIP (.zip, .jar) and ZOO (.zoo)