message: Fix volumes (which are now forwarded to VKL)
diff: #include "render/DistributedLoadBalancer.h"
  #include "render/RenderTask.h"
  #include "render/distributed/DistributedRaycast.h"
  +#include "volume/Volume.h"
  #include "volume/VolumetricModel.h"
  #include "volume/transferFunction/TransferFunction.h"
  #include "openvkl/openvkl.h"
  @@ -345,7 +346,7 @@ OSPCamera MPIDistributedDevice::newCamera(const char *type)
  OSPVolume MPIDistributedDevice::newVolume(const char *type)
  {
  - return createLocalObject<Volume, OSPVolume>(type);
  + return (OSPVolume) new Volume(type);
  }
  OSPGeometry MPIDistributedDevice::newGeometry(const char *type)
  