///Creates a new LP problem

     ///Creates a new LP problem

     LpSolverBase &newLp() {return _newLp();}

     LpSolverBase &newLp() {return _newLp();}

     ///Makes a copy of the LP problem

     ///Makes a copy of the LP problem

     LpSolverBase &copyLp() {return _copyLp();}

     LpSolverBase &copyLp() {return _copyLp();}

     ///@{

     ///@{

     ///Add a new empty column (i.e a new variable) to the LP

     ///Add a new empty column (i.e a new variable) to the LP

     Col addCol() { Col c; c.id=cols.insert(_addCol()); return c;}

     Col addCol() { Col c; c.id=cols.insert(_addCol()); return c;}