RAR archive reader for Python.

This is Python module for RAR archive reading.  The interface
is made as zipfile like as possible.  Licensed under ISC
license.
- Supports both RAR3 and RAR5 format archives.
- Supports multi volume archives.
- Supports Unicode filenames.
- Supports password-protected archives.
- Supports archive and file comments.
- Archive parsing and non-compressed files handled in pure Python code.
- For compressed files runs ``unrar`` utility.

NOTE: Can swap unrar dependency for unrar-free, with whatever
limitations unrar-free has over the proprietary unrar.
