message: Add version flags to adios2-config
diff: function usage() {
  - echo "adios2-config (--help | [--c-flags] [--c-libs] [--cxx-flags] [--cxx-libs] [-fortran-flags] [--fortran-libs])"
  - echo " --help Display help information"
  + echo "adios2-config [OPTION]"
  + echo " -h, --help Display help information"
  + echo " -v, --version Display version information"
  echo " -c Both compile and link flags for the C bindings"
  echo " --c-flags Preprocessor and compile flags for the C bindings"
  echo " --c-libs Linker flags for the C bindings"
  - echo " -x Both compile and link flags for the C++ bindings"
  + echo " -x, -cxx Both compile and link flags for the C++ bindings"
  echo " --cxx-flags Preprocessor and compile flags for the C++ bindings"
  echo " --cxx-libs Linker flags for the C++ bindings"
  - echo " -f Both compile and link flags for the F90 bindings"
  + echo " -f, --fortran Both compile and link flags for the F90 bindings"
  echo " --fortran-flags Preprocessor and compile flags for the F90 bindings"
  echo " --fortran-libs Linker flags for the F90 bindings"
  }
  @@ -33,13 +34,19 @@ do
  -c) CF=1; CL=1 ;;
  --c-flags) CF=1 ;;
  --c-libs) CL=1 ;;
  - -x) CXXF=1; CXXL=1 ;;
  + -x|--cxx) CXXF=1; CXXL=1 ;;
  --cxx-flags) CXXF=1 ;;
  --cxx-libs) CXXL=1 ;;
  - -f) FF=1; FL=1 ;;
  + -f|--fortran) FF=1; FL=1 ;;
  --fortran-flags) FF=1 ;;
  --fortran-libs) FL=1 ;;
  - --help)
  + -v|--version)
  + echo "ADIOS @ADIOS2_VERSION@"
  + echo "Copyright (c) 2019 UT-BATTELLE, LLC"
  + echo "Licensed under the Apache License, Version 2.0"
  + exit 0
  + ;;
  + -h|--help)
  usage
  exit 1
  ;;
  