catkin: provide catkin compatible package.xml file

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
catkin: added run_depend on catkin to package.xml for released packages

Signed-off-by: Johannes Meyer <johannes@intermodalics.eu>
Prepare 2.7 release

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
fix the test suite
fix undirected_graph w.r.t. recent versions of boost

Code copied back from Roby's BGL wrappers