Update to 0.42a. From the changelog:

- Add compatibility to Python 3 (and retain Python 2)
    - Remove python<3.0 restriction in setup.py
    - Make compatible to BeautifulSoup4
    - Accept octal representations of Python 2 (0nnn) and Python 3 (0onnn)
    - Prevent iterator being changed while iterating
    - Python 2/3 compatible treatment of max(n, None)
    - Prevent "Exception ... ignored" in `redo-log ... | head`
    - Distinguish byte (python2 str type) and unicode strings (python 3 str type)
    - Set file descriptor as inheritable for all pythons >=3.4
    - Unify print function usage for Python 2 and 3 via __future__ import
    - Run 2to3 utility
    - Remove python interpreter selection
- GettingStarted.md: Add -E option to sudo to preserve environment
- docs/cookbook/c: missing quote char.

(schmonz)