message: Better ringmesh home variable.
diff: # 54518 VANDOEUVRE-LES-NANCY
  # FRANCE
  -find_path(RINGMesh_INCLUDE_DIR NAMES ringmesh PATHS ${RINGMesh_HOME}/include)
  +SET(RINGMESH_ROOT_DIRECTORY ${CMAKE_MODULE_PATH}/..)
  +
  +find_path(RINGMesh_INCLUDE_DIR NAMES ringmesh PATHS ${RINGMESH_ROOT_DIRECTORY}/include)
  # On Windows there is no CMAKE_BUILD_TYPE variable since everything is in the same project.
  # It is necessary to differenciate Release and Debug.
  if(WIN32)
  - find_path(RINGMesh_CONFIG_INCLUDE_DIR NAMES ringmesh PATHS ${RINGMesh_HOME}/build/ringmesh)
  - find_library(RINGMesh_DEBUG_LIBRARY NAMES RINGMesh PATHS ${RINGMesh_HOME}/build/ringmesh/lib/Debug)
  - find_library(RINGMesh_RELEASE_LIBRARY NAMES RINGMesh PATHS ${RINGMesh_HOME}/build/ringmesh/lib/Release)
  - find_library(GEOGRAM_DEBUG_LIBRARY NAMES geogram PATHS ${RINGMesh_HOME}/build/geogram/lib/Debug)
  - find_library(GEOGRAM_RELEASE_LIBRARY NAMES geogram PATHS ${RINGMesh_HOME}/build/geogram/lib/Release)
  + find_path(RINGMesh_CONFIG_INCLUDE_DIR NAMES ringmesh PATHS ${RINGMESH_ROOT_DIRECTORY}/build/ringmesh)
  + find_library(RINGMesh_DEBUG_LIBRARY NAMES RINGMesh PATHS ${RINGMESH_ROOT_DIRECTORY}/build/ringmesh/lib/Debug)
  + find_library(RINGMesh_RELEASE_LIBRARY NAMES RINGMesh PATHS ${RINGMESH_ROOT_DIRECTORY}/build/ringmesh/lib/Release)
  + find_library(GEOGRAM_DEBUG_LIBRARY NAMES geogram PATHS ${RINGMESH_ROOT_DIRECTORY}/build/geogram/lib/Debug)
  + find_library(GEOGRAM_RELEASE_LIBRARY NAMES geogram PATHS ${RINGMESH_ROOT_DIRECTORY}/build/geogram/lib/Release)
  else(WIN32)
  - find_path(RINGMesh_CONFIG_INCLUDE_DIR NAMES ringmesh PATHS ${RINGMesh_HOME}/build/ringmesh/${CMAKE_BUILD_TYPE})
  - find_library(RINGMesh_LIBRARY NAMES RINGMesh PATHS ${RINGMesh_HOME}/build/ringmesh/${CMAKE_BUILD_TYPE}/lib)
  - find_library(GEOGRAM_LIBRARY NAMES geogram PATHS ${RINGMesh_HOME}/build/geogram/${CMAKE_BUILD_TYPE}/lib)
  + find_path(RINGMesh_CONFIG_INCLUDE_DIR NAMES ringmesh PATHS ${RINGMESH_ROOT_DIRECTORY}/build/ringmesh/${CMAKE_BUILD_TYPE})
  + find_library(RINGMesh_LIBRARY NAMES RINGMesh PATHS ${RINGMESH_ROOT_DIRECTORY}/build/ringmesh/${CMAKE_BUILD_TYPE}/lib)
  + find_library(GEOGRAM_LIBRARY NAMES geogram PATHS ${RINGMESH_ROOT_DIRECTORY}/build/geogram/${CMAKE_BUILD_TYPE}/lib)
  endif(WIN32)
  -find_path(GEOGRAM_INCLUDE_DIR NAMES geogram PATHS ${RINGMesh_HOME}/third_party/geogram/src/lib)
  -find_path(THIRD_PARTY_INCLUDE_DIR NAMES zlib PATHS ${RINGMesh_HOME}/third_party)
  +find_path(GEOGRAM_INCLUDE_DIR NAMES geogram PATHS ${RINGMESH_ROOT_DIRECTORY}/third_party/geogram/src/lib)
  +find_path(THIRD_PARTY_INCLUDE_DIR NAMES zlib PATHS ${RINGMESH_ROOT_DIRECTORY}/third_party)
  include(FindPackageHandleStandardArgs)
  