version: mark the current source as development version for 6.0.0
This is useful to distinguish the development version from the latest tagged
version. In this particular case, this will allow us to publish a pre-version on
pypi.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes