integrate with catkin_tools

[asmodehn]

It would be interesting to see if we can integrate with catkin_tools somehow...

One option could be to add a verb to catkin_tools that :

• install dependencies from requirements.txt files
• install packages from their setup.py via pip as editable for devel, without going through the CMakeLists.txt processing.
• install packages from their setup.py via pip for install

[asmodehn]

Maybe it s not an integration, but a different way to achieve the same thing : installation managed by pip and not by catkin...