Main modifications since version 0.6.0

  - A lot of cleaning among functions that were not used
    - broadphase has been removed,
    - cost and cost source have been removed,

  - CollisionRequest is passed to low level functions in order to unify
    the calling function tree among the various possible options,

  - Collision test triangle - triangle
    - in GJK, a detection of loop that made the algorithm fail to detect
      collision has been removed,
    - collision and distance computation between triangles in
      MeshCollisionTraversalNode::leafTesting now uses GJK
    - a test on triangle - triangle interaction has been added optimality of
      closest points is check using Karush-Kuhn-Tucker conditions.

Main modifications since version 0.5.1

  - Fix octomap version handling,
  - add flags related to Octomap in pkg-config file.