Fix integer comparison and missing install file warnings

dune/vtk/datacollectors/CMakeLists.txt

@@ -2,6 +2,7 @@
 install(FILES
   continuousdatacollector.hh
   discontinuousdatacollector.hh
+  lagrangedatacollector.hh
   quadraticdatacollector.hh
   spdatacollector.hh
   structureddatacollector.hh

dune/vtk/utility/lagrangepoints.hh

@@ -180,7 +180,7 @@ namespace Dune
         // "Barycentric index" is a set of 4 integers, each running from 0 to
         // <Order>. It is the index of a point in the tetrahedron in barycentric
         // coordinates.
-        static void barycentricIndex (std::size_t p, std::array<int,4>& bindex, int order);
+        static void barycentricIndex (int p, std::array<int,4>& bindex, int order);
 
         // Construct the point set in the heyhedral element
         // 1. build equispaced points with index tuple (i,j,k)

dune/vtk/utility/lagrangepoints.impl.hh

@@ -330,7 +330,7 @@ void LagrangePointSetBuilder<K,3>::buildTetra (std::size_t nPoints, int order, P
 // <Order>. It is the index of a point in the tetrahedron in barycentric
 // coordinates.
 template <class K>
-void LagrangePointSetBuilder<K,3>::barycentricIndex (std::size_t p, std::array<int,4>& bindex, int order)
+void LagrangePointSetBuilder<K,3>::barycentricIndex (int p, std::array<int,4>& bindex, int order)
 {
   const int nVertexDOFs = 4;
   const int nEdgeDOFs = 6 * (order-1);