Fix for problem where leaves could get lost, and warning would show up. Now we use leaf indices directly for seeding, instead of doing a look up
Changed OctreePointcloud Adjacency to use std::list instead of std::set, added comparator to SupervoxelHelper so that the internal set of voxels owned by a helper is sorted by index instead of memory location
Added brief comment explaining comparator
Removed public interface for modifying neighbors of OctreePointcloudAdjacencyContainer. Neighbors can now only be added/removed from within OctreePointcloudAdjacency. This does *not* mean neighbors can't be modified, just that the list of neighbors itself can't be modified.
Merge pull request #912 from jpapon/supervoxel_loop_problem

Fix for issue #905.