Add new collision examples + triangle/OBB bug fixes + add new tests

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9877 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: added AssemblyVisitor::updateConstraintAndMomentum
MechanicalVisitor: added MechanicalPropagatePositionVisitor

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9878 b7f1a160-662a-0410-a6d8-bea165342f16
CHANGE configuration file: move a plugin activation

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9879 b7f1a160-662a-0410-a6d8-bea165342f16
DAG:
- fixing a pruning bug
- fixing a more vicious bug about bottom-up execution order. This is NOT this inverse order of the global top-down. As soon a a branch is finished, it bottom-up must be executed. It was creating a bug for interaction penalty forces with a not-simulated collision model.

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9880 b7f1a160-662a-0410-a6d8-bea165342f16