hdf5_ep

[svn-r3002] 
Purpose:
    Bug fix
Description:
    H5S_mpio_spaces_xfer() did not do clean up all the times especially
    the MPI_type freeing.
Solution:
     Include the MPI_type freeing as part of cleanup code.  Replaced
     most HRETURN_ERROR(...) with HGOTO_ERROR so that cleanup code
     will be executed.
Platforms tested:
    IRIX64-64.