On our PR2, there's a file /opt/ros/groovy/stacks/pr2_robot/pr2_bringup/pr2_bringup.launch
There's also a pr2.launch , which is basically the same as pr2_bringup.launch, and exactly the same as the pr2.launch in this repo.
Our Groovy robot.launch refers to pr2_bringup.launch. Is this a vestige?