Vcstool has been stale

I believe that the Deb release (python3-vcstool or through ros-dev-tools) should continue as-is. For PyPI, the plan is to release it under a different name.

The tricky part of this is that the pypi name need to match the Python package name, so if you want to release on PyPI with a name different from vcstool, I guess we also need to change the name in vcstool/setup.py at de18e196396e5d7d3dda75ad92304f8e22352c30 · ros-infrastructure/vcstool · GitHub, while the Python module name (i.e. the one used in import vcstool) can remain vcstool.