- Old code covered almost everything. Now we just have a few categories:

  Attributes
  ~~~~~~~~~~
      Put: int, scalar, string, arrays of the same

  Variables
  ~~~~~~~~~
      - Put ONE label (eg, nCells).
        Write as global array with offset according to the procI.

      - Put List<T>
        Write as local data of the underlying cmptType.
        Tag dimensions as size * nComponents.

      - define stream (bytes)
      - write  stream data (bytes)