message: fix spio examples
diff: #------------------------------------------------------------------------------
  # List of single source file examples
  #------------------------------------------------------------------------------
  -set(example_sources
  +set(spio_example_sources
  IORead.cpp
  IOWrite.cpp
  )
  if (SCR_FOUND)
  - list(APPEND example_sources IO_SCR_Read.cpp)
  - list(APPEND example_sources IO_SCR_Write.cpp)
  - list(APPEND example_sources IO_SCR_Checkpoint.cpp)
  - list(APPEND example_sources IO_SCR_Output.cpp)
  + # TODO: Add these as a headers to a unified example driver and can be run as tests?
  + list(APPEND spio_example_sources IO_SCR_Read.cpp)
  + list(APPEND spio_example_sources IO_SCR_Write.cpp)
  + list(APPEND spio_example_sources IO_SCR_Output.cpp)
  endif()
  set(spio_example_depends axom ${EXTRA_LIBS})
  @@ -28,7 +28,7 @@ blt_list_append(TO spio_example_depends ELEMENTS scr IF SCR_FOUND)
  #------------------------------------------------------------------------------
  # Add targets and tests for spio examples
  #------------------------------------------------------------------------------
  -foreach(src ${example_sources})
  +foreach(src ${spio_example_sources})
  get_filename_component(exe_name ${src} NAME_WE)
  blt_add_executable(
  NAME spio_${exe_name}_ex
  @@ -40,9 +40,11 @@ foreach(src ${example_sources})
  endforeach()
  if(SCR_FOUND AND AXOM_ENABLE_TESTS)
  + # Note: This example is a combination of a test and an example due
  + # inability to run two SCR executables at the same time
  blt_add_executable(
  - NAME spio_scr_ex
  - SOURCES spio_scr.cpp
  + NAME spio_IO_SCR_Checkpoint_ex
  + SOURCES IO_SCR_Checkpoint.cpp
  OUTPUT_DIR ${EXAMPLE_OUTPUT_DIRECTORY}
  DEPENDS_ON ${spio_example_depends} scr gtest
  FOLDER axom/sidre/examples
  