message: Bugfix in core (cuda): Vectormath static fields.
  The static fields are now always set to zero in respective function calls.
diff: @@ -185,9 +185,12 @@ namespace Engine
  int threads = 512;
  int blocks = min((N + threads - 1) / threads, 1024);
  - static scalarfield out_min(blocks);
  - static scalarfield out_max(blocks);
  - static scalarfield temp(1);
  + static scalarfield out_min(blocks, 0);
  + Vectormath::fill(out_min, 0);
  + static scalarfield out_max(blocks, 0);
  + Vectormath::fill(out_max, 0);
  + static scalarfield temp(1, 0);
  + Vectormath::fill(temp, 0);
  cu_MinMax<<<blocks, threads>>>(&vf[0][0], out_min.data(), out_max.data(), N);
  cu_MinMax<<<1, 1024>>>(out_min.data(), out_min.data(), temp.data(), blocks);
  @@ -381,6 +384,7 @@ namespace Engine
  int blocks = min((N + threads - 1) / threads, 1024);
  static scalarfield ret(1, 0);
  + Vectormath::fill(ret, 0);
  cu_sum<<<blocks, threads>>>(sf.data(), ret.data(), N);
  cudaDeviceSynchronize();
  return ret[0];
  @@ -393,6 +397,7 @@ namespace Engine
  int blocks = min((N + threads - 1) / threads, 1024);
  static scalarfield ret(1, 0);
  + Vectormath::fill(ret, 0);
  cu_sum<<<blocks, threads>>>(sf.data(), ret.data(), N);
  cudaDeviceSynchronize();
  ret[0] = ret[0]/N;
  @@ -465,6 +470,7 @@ namespace Engine
  int blocks = min((N + threads - 1) / threads, 1024);
  static vectorfield ret(1, {0,0,0});
  + Vectormath::fill(ret, {0,0,0});
  cu_sum<<<blocks, threads>>>(vf.data(), ret.data(), N);
  cudaDeviceSynchronize();
  return ret[0];
  @@ -477,6 +483,7 @@ namespace Engine
  int blocks = min((N + threads - 1) / threads, 1024);
  static vectorfield ret(1, {0,0,0});
  + Vectormath::fill(ret, {0,0,0});
  cu_sum<<<blocks, threads>>>(vf.data(), ret.data(), N);
  cudaDeviceSynchronize();
  ret[0] = ret[0]/N;
  @@ -498,7 +505,8 @@ namespace Engine
  scalar dot(const vectorfield & vf1, const vectorfield & vf2)
  {
  int n = vf1.size();
  - static scalarfield sf(n);
  + static scalarfield sf(n, 0);
  + Vectormath::fill(sf, 0);
  scalar ret;
  // Dot product
  