message: messagelayer now works with volumeserver
diff: -PROJECT(MAML)
  -CMAKE_MINIMUM_REQUIRED(VERSION 3.5)
  -
  -SET(MAML_DIR "${CMAKE_CURRENT_SOURCE_DIR}" CACHE INTERNAL "" FORCE)
  -
  -IF (INCLUDED_AS_AN_OSPRAY_COMPONENT)
  OSPRAY_BUILD_COMPONENT(mpiCommon)
  - OSPRAY_CONFIGURE_MPI()
  -
  - # this was included as a submodule from something that already
  - # provides the ospcommon library (likely, ospray), so don't try to
  - # build it again. Also, this means that all external dependencies
  - # such as tbb, include dirs etc are already set
  -ELSE()
  - FIND_PACKAGE(MPI REQUIRED)
  -
  - INCLUDE_DIRECTORIES(${MAML_DIR})
  - INCLUDE_DIRECTORIES(${MAML_DIR}/include)
  -
  -# SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
  - INCLUDE(ospcommon/FindTBB.cmake)
  +SET(MAML_LIBRARY ospray_mpi_maml)
  +SET(MAML_DIR ${CMAKE_CURRENT_SOURCE_DIR})
  - INCLUDE_DIRECTORIES(${TBB_INCLUDE_DIR})
  - INCLUDE_DIRECTORIES(SYSTEM ${MPI_INCLUDE_PATH})
  -
  - # ------------------------------------------------------------------
  - # OSPCommon library
  - # ------------------------------------------------------------------
  - ADD_LIBRARY(ospcommon SHARED
  - ospcommon/common.cpp
  - ospcommon/library.cpp
  - ospcommon/FileName.cpp
  - ospcommon/sysinfo.cpp
  - )
  - TARGET_LINK_LIBRARIES(ospray_common
  - ${TBB_LIBRARY}
  - )
  -ENDIF()
  +OSPRAY_CONFIGURE_MPI()
  -SET(MAML_LIBRARY maml)
  -IF (";${MAML_LIBRARY_NAME_PREFIX}" STREQUAL ";")
  - SET(MAML_LIBRARY maml)
  -ELSE()
  - SET(MAML_LIBRARY "${MAML_LIBRARY_NAME_PREFIX}maml")
  -ENDIF()
  # ------------------------------------------------------------------
  # The MAML library itself
  # ------------------------------------------------------------------
  