message: Added test for changing count
diff: call adios2_define_variable(variables(13), ioWrite, "var_changingR64", &
  adios2_type_dp, 1, &
  adios2_null_dims, adios2_null_dims, changing_count_dims, &
  - adios2_constant_dims, ierr)
  + adios2_variable_dims, ierr)
  write (*, *) "Engine type: ", ioWrite%engine_type
  if (TRIM(ioWrite%engine_type) /= 'File') stop 'Wrong engine_type'
  