[svn-r4097] Purpose:

    Bug fixes
Description:
    H5FDmpio.c:
	H5FD_mpio_flush() would try to file seek negative if the
	file->eoa is 0 (e.g., doing mpio on the raw-file of the
	split file driver).  Put in a code to catch this case
	by returning succeed immediately.
    H5S.c:
	SAF test code exposed an error in the HDF5_MPI_OPT_TYPES
	code.  The SAF code was doing collective write to chunked
	storage dataset.  Some processes wanted to flush some chunk
	while some other processes were doing something else but the
	HDF5_MPI_OPT_TYPES code thought the chunk flushing were collective
	calls since it only looked at the condition when H5Dwrite
	was called.  So, it hanged when doing MPI_File_setview.
	For now, turned off the HDF5_MPI_OPT_TYPES code so that the
	SAF code would work.  More long term fix later.
Solution:
Platforms tested:
    eirene (serial and mpich), modi4 -64-serial and -n32-parallel.

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