pj_transform with 3 variables

modules/slimFunction/proj.i

@@ -12,6 +12,10 @@
   #include "proj_api.h"
   #include "fullMatrix.h"
   #include "dgFullMatrix.h"
+  double pj_transform( projPJ src, projPJ dst, double &x, double &y, double &z) {
+    pj_transform(src, dst, 1, 1, &x, &y, &z);
+    return x;
+  }
   double pj_transform( projPJ src, projPJ dst, double &x, double &y) {
     pj_transform(src, dst, 1, 1, &x, &y, NULL);
     return x;
@@ -34,4 +38,6 @@ int pj_is_latlong(projPJ);
 fullMatrix<double> pjTransform(projPJ src, projPJ dst, const fullMatrix<double> &coord);
 %apply double *INOUT {double &x, double &y};
 void pj_transform(projPJ src, projPJ dst, double &x, double &y);
+%apply double *INOUT {double &x, double &y, double &z};
+void pj_transform(projPJ src, projPJ dst, double &x, double &y, double &z);
 void pjTransformInPlace(projPJ src, projPJ dst,fullMatrix<double> &coord);