catkin: added run_depend on catkin to package.xml for released packages

Signed-off-by: Johannes Meyer <johannes@intermodalics.eu>
Preparing 2.7.0 release

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
cmake: fix finding library using pkgconfig

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
update release version

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>