ImagePlugin: add LabelBoxImageToolBox

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9845 b7f1a160-662a-0410-a6d8-bea165342f16
ImagePlugin: fix freezed slider in LabelPointsBySectionITB; add lines drawing in secondary views of LabelPointsBySectionITB

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@9846 b7f1a160-662a-0410-a6d8-bea165342f16