Make Get Min/Max Weight functions in substitution matrix const and

export them to Python

modules/seq/alg/pymod/wrap_seq_alg.cc

@@ -61,6 +61,8 @@ BOOST_PYTHON_MODULE(_ost_seq_alg)
   class_<SubstWeightMatrix, SubstWeightMatrixPtr>("SubstWeightMatrix", init<>())
     .def("GetWeight", &SubstWeightMatrix::GetWeight)
     .def("SetWeight", &SubstWeightMatrix::SetWeight)
+    .def("GetMinWeight", &SubstWeightMatrix::GetMinWeight)
+    .def("GetMaxWeight", &SubstWeightMatrix::GetMaxWeight)
   ;
   
   def("MergePairwiseAlignments", &MergePairwiseAlignments);

modules/seq/alg/src/subst_weight_matrix.hh

@@ -65,10 +65,10 @@ public:
   }
 
   /// \brief Get the minimal substitution weight of the matrix
-  WeightType GetMinWeight() { return min_weight_; }
+  WeightType GetMinWeight() const { return min_weight_; }
 
   /// \brief Get the maximal substitution weight of the matrix
-  WeightType GetMaxWeight() { return max_weight_; }
+  WeightType GetMaxWeight() const { return max_weight_; }
 
   /// \brief Set the substitution weight between two amino acids
   ///