Compliant:
- moving constraint damping from BaseForceField to ConstraintValue (Warning this is actually not taken into account anyway but it should coming back soon)
- adding a constraint value for contact with restitution

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10170 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: adding a BaseConstraintValue. Only ConstraintValue (find a new name?) will have a damping ratio member.

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10171 b7f1a160-662a-0410-a6d8-bea165342f16
QT GUI: removing warnings at startup

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10172 b7f1a160-662a-0410-a6d8-bea165342f16