Changes since v4.7.0:
- move urdf to example-robot-data

Changes since v4.5.0:
- depend on example-robo-data for ur_description
- python 3 compatibility

if it has been installed from robotpkg

Changes since v4.2.1:
- [CMake] find xacro executable
- Make root joint type parameterizable.

Packaging changes:
- Removed patch-aa, applied upstream