Don't forget version at the end of setup.py, write it only if changed. This fixes issue159: "python setup.py install" shouldn't write new files in the working dir if one has done "python setup.py build" first.

abort: Failed to parse .../t/.hg/hgrc
File contains no section headers.
file: .../t/.hg/hgrc, line: 1
'invalid\n'