[Robot Wrapper] Expose model

include/pininvdyn/robot-wrapper.hpp

@@ -75,6 +75,7 @@ namespace pininvdyn
     /// \returns a const reference on the model.
     ///
     const Model & model() const;
+    Model & model();
 
     void computeAllTerms(Data & data, const Vector & q, const Vector & v) const;
 

src/robot-wrapper.cpp

@@ -54,6 +54,7 @@ namespace pininvdyn
   int RobotWrapper::nv() const { return m_model.nv; }
 
   const Model & RobotWrapper::model() const { return m_model; }
+  Model & RobotWrapper::model() { return m_model; }
 
   void RobotWrapper::computeAllTerms(Data & data, const Vector & q, const Vector & v) const
   {