Visualization with glowing and solid spheres.
depth corrected sphere impostor
Merge branch 'master' of https://github.com/urp/afc.git into position-visualization
Merge branch 'master' of https://github.com/urp/afc into position-visualization

Conflicts:
	src/osgview/node/robot/group.cpp
	src/osgview/node/sensor/position_attitude_ribbon_geometry.cpp
	src/osgview/viewer.cpp