Restore kwargs compatibility with previous version

Author: lballabio

SWIG/interpolation.i

@@ -62,9 +62,9 @@ class Safe##T {
   public:
     Safe##T(const Array& x, const Array& y);
     Real operator()(Real x, bool allowExtrapolation = false) const;
-    Real primitive(Real x, bool allowExtrapolation = false) const;
-    Real derivative(Real x, bool allowExtrapolation = false) const;
-    Real secondDerivative(Real x, bool allowExtrapolation = false) const;
+    Real derivative(Real x, bool extrapolate = false) const;
+    Real secondDerivative(Real x, bool extrapolate = false) const;
+    Real primitive(Real x, bool extrapolate = false) const;
 };
 %enddef
 

SWIG/volatilities.i

@@ -452,6 +452,9 @@ using QuantLib::BlackVarianceCurve;
 
 %shared_ptr(BlackVarianceCurve);
 class BlackVarianceCurve : public BlackVolTermStructure {
+    #if !defined(SWIGJAVA) && !defined(SWIGCSHARP)
+    %feature("kwargs") BlackVarianceCurve;
+    #endif
   public:
     BlackVarianceCurve(const Date& referenceDate,
                        const std::vector<Date>& dates,