Fence detection node and test graph

The test graph needs to be fed left and right image_rect_color and
image_rect.
Launch file and params for mapping fence detection point clouds
Added fence detection/mapping to the driving test launch file
Added machine declaration to launch file
Rename launch files from .xml to .launch
Install launch files
Install config fence detector files
Fix XML file syntax
Remap point cloud info into fence detector
fix topic typo
Copy header on disparity image to output
Add fence detections to rviz config
Try using a rolling window for fence detections
Merge remote-tracking branch 'robot/fence_mapping' into sample_grasp

Conflicts:
	ros_workspace/src/samplereturn/launch/driving_test.launch
	ros_workspace/src/samplereturn/rviz/WholeRobot.rviz
Add frequency detector to Cmake install
Fence detection launch file, better mat loading
Color name mat for python