Define a typedef for list of BodyPairCollision.
Implement tolerance in ContinuousCollisionChecking

  - At the end of interval validation, remove the part relative to penetration
    for each pair.
Fix bug when maximal velocity is equal to zero.
Implement collision and distance computation with environment outside Device

  Add class CollisionValidation for collision,
  add class DistanceBetweenObjects for distance computation.