[svn-r12553] This check-in includes the following part of parallel optimization codes:

1. Provide another option for users to do independent IO with MPI file setview(collectively)
2. With the request of collective IO from users, using Independent IO with MPI file setview if we find collective IO is not good for the applications for IO per chunk(multi-chunk IO) case. Previously we used pure independent IO and that actually performed small IO(IO each row) for this case. The recent performance study suggested the independent IO with file setview can acheieve significantly better performance than collective IO when not many processes participate in the IO.
3. For applications that explicitly choose to do collective IO per chunk case, the library won't do any optimization(gather/broadcast) operations. The library simply passes the collective IO request to MPI-IO. 

Tested at copper, kagiso, heping, mir and tungsten(cmpi and mpich)
Kagiso is using LAM, t_mpi test was broken even.
The cchunk10 test  failed at heping and mir. I suspected it was an MPICH problem. Will investigate later.
Everything passed at copper.
at tungsten: the old cmpi bug(failed at esetw) is still there. Other tests passed.
Some sequential fheap tests failed at kagiso.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/H5Dpkg.h b/src/H5Dpkg.h
index f6946f2..da44370 100644
--- a/src/H5Dpkg.h
+++ b/src/H5Dpkg.h
@@ -107,6 +107,7 @@ typedef struct H5D_io_info_t {
 #ifdef H5_HAVE_PARALLEL
     MPI_Comm comm;              /* MPI communicator for file */
     hbool_t xfer_mode_changed;  /* Whether the transfer mode was changed */
+    hbool_t xfer_opt_mode_changed;
 #endif /* H5_HAVE_PARALLEL */
     const H5D_storage_t *store; /* Dataset storage info */
     H5D_io_ops_t ops;           /* I/O operation function pointers */