rtt: removed corba stuff from package.xml
working on re-adding rosbuild support for downstream packages
rtt: also respect LIBRARY_OUTPUT_PATH cmake variable in UseOROCOS-RTT.cmake as many rosbuild-style packages use it
rtt: search for a rosbuild package in orocos_use_package() and recurse
Merge branch 'catkin' into rosbuild_support
Merge pull request #3 from meyerj/rosbuild_support

Pulling in Johannes's Rosbuild support