Merge remote-tracking branch 'origin/devel' into liegroup-element

include/hpp/manipulation/axial-handle.hh

include/hpp/manipulation/graph/edge.hh

include/hpp/manipulation/graph/graph-component.hh

include/hpp/manipulation/graph/graph.hh

include/hpp/manipulation/graph/helper.hh

include/hpp/manipulation/graph/state-selector.hh

include/hpp/manipulation/graph/state.hh

include/hpp/manipulation/graph/statistics.hh

include/hpp/manipulation/handle.hh

include/hpp/manipulation/problem-solver.hh

include/hpp/manipulation/roadmap-node.hh

include/hpp/manipulation/symbolic-component.hh

src/axial-handle.cc

src/graph-node-optimizer.cc

src/graph/edge.cc

src/graph/graph-component.cc

src/graph/graph.cc

src/graph/helper.cc

src/graph/state.cc

src/graph/statistics.cc