Merge remote-tracking branch 'jmirabel/devel' into devel

doc/opengl_primitives.png

idl/gepetto/viewer/graphical-interface.idl

include/gepetto/gui/bodytreewidget.hh

include/gepetto/gui/dialog/pluginmanagerdialog.hh

include/gepetto/gui/fwd.hh

include/gepetto/gui/tree-item.hh

include/gepetto/gui/ui/mainwindow.ui

include/gepetto/gui/windows-manager.hh

include/gepetto/viewer/corba/windows-manager.hh

plugins/pyqcustomplot/decorator.hh

src/gui/bodytreewidget.cc

src/gui/dialog/pluginmanagerdialog.cc

src/gui/mainwindow.cc

src/gui/tree-item.cc

src/gui/windows-manager.cc