modify 1


git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10257 b7f1a160-662a-0410-a6d8-bea165342f16
test


git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10258 b7f1a160-662a-0410-a6d8-bea165342f16
Modify stiffness acording to elongation (the closer the stiffer)


git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10259 b7f1a160-662a-0410-a6d8-bea165342f16
Add rcos and rsin functions

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10260 b7f1a160-662a-0410-a6d8-bea165342f16
Add option theCloserTheStiffer to keep old behavior


git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10261 b7f1a160-662a-0410-a6d8-bea165342f16