Preparations for PCL and pcl-ros package

The pcl_ros package requires nodelet_topic_tools. The nodelet_topic_tools require dynamic_reconfigure_native. For dynamic_reconfigure_native, further existing packages must provide a native recipe. The point cloud library requires libflann.
Currently, bitbake nodelet-topic-tools-native does not configure, but I would like to put the current state upstream to discuss the issue publicly.
The PCL and pcl-ros package are provided in a future pull request, as they are still in my own development.