Documentation

Uses sphinx. See https://wiki.debian.org/Python/LibraryStyleGuide#Sphinx_documentation and https://wiki.debian.org/Python/LibraryStyleGuide#Documentation_package

doc-generation needs python module catkin-sphinx which should be in debian package python-catkin-sphinx. Which means we need to package https://github.com/ros-infrastructure/catkin-sphinx

Then it should be straightforward to follow above wiki info to generate docs for all packages that have them.