Compliant: fixing UniformCompliance damping

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10516 b7f1a160-662a-0410-a6d8-bea165342f16
Compliance: improving assembly. The interactionForceFields that work on a unique set of DOFs are assemblable.

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10517 b7f1a160-662a-0410-a6d8-bea165342f16