image : add branching image merger and fixed open mesh rasterization example

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9774 b7f1a160-662a-0410-a6d8-bea165342f16
update:  openmp parallelization in shape matching engine

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9775 b7f1a160-662a-0410-a6d8-bea165342f16
registration: fixed compilation (dependencies with image plugin)

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9776 b7f1a160-662a-0410-a6d8-bea165342f16