This module is used only by the VR Studio programmers who are using the ctattach tools. It is imported before any other package, and its job is to figure out the correct paths to each of the packages.
This module is not needed if you are not using ctattach; in this case all of the Panda packages will be collected under a common directory, which you will presumably have already on your PYTHONPATH.
Add to sys.path the appropriate director(ies) to search for the various Panda projects. Typically, these will all be in the same directory (which is presumably already on sys.path), but if the VR Studio ctattach tools are in use they could be scattered around in several places.