IPOPTSolverLean: thinner API: no-constraint case by default arg

NSolver/IPOPTSolverLean.cc

@@ -500,14 +500,6 @@ solve
       << " infeasible and " << n_almost_inf[i] << " almost infeasible\n")
 }
 
-void
-IPOPTSolverLean::
-solve(NProblemInterface* _problem)
-{
-  std::vector<NConstraintInterface*> constraints;
-  solve(_problem, constraints);
-}
-
 double
 IPOPTSolverLean::
 energy()

NSolver/IPOPTSolverLean.hh

@@ -97,8 +97,6 @@ public:
    const std::vector<NConstraintInterface*>& _constraints,
    const std::vector<NConstraintInterface*>& _lazy_constraints);
 
-  void solve(NProblemInterface* _problem);
-
   //! Get the computed solution energy
   double energy();