API changes concerning SAC models, plus new SAC model
in preparation for Diamondback 1.0 PCL release we have made the API a
bit more consistent. This might break your existing code, for which we
apologize, but it's a good change that will make different SAC model
types more aptly named.
Specifically, SAC_MODEL_ORIENTED_LINE is now SAC_MODEL_PARALLEL_LINE,
and SAC_MODEL_ORIENTED_PLANE is SAC_MODEL_PERPENDICULAR_PLANE.
Also, there is a new SAC_MODEL_PARALLEL_PLANE model that looks for
planes that are parallel to a user-given axis. This addition kind of
made the renaming necessary.