message: enabled -Wall for PWGUD code
diff: # * provided "as is" without express or implied warranty. *
  # **************************************************************************
  +set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
  +
  add_subdirectory(base)
  add_subdirectory(DIFFRACTIVE)
  add_subdirectory(FirstPhysics)
  