added comment to move meViewerArea::open to medViewContainer one day.
added comment to move meViewerArea::open to medViewContainer one day.

rdebroiz/medInria-public,NicolasSchnitzler/medInria-public,aabadie/medInria-public,aabadie/medInria-public,aabadie/medInria-public,rdebroiz/medInria-public,NicolasSchnitzler/medInria-public,NicolasSchnitzler/medInria-public,rdebroiz/medInria-public