hdf5_msb

[svn-r25632] Purpose: Fixed HDFFV-8852
Description:
    H5F_ACC_CREAT was included in the C++ API while the C library doesn't
    allow it yet.  Possibly, in the future, but not now.  In addition, the
    two flags H5F_ACC_RDONLY and H5F_ACC_RDWR were missing from the
    documentation, causing confusion that appending is not supported.
Solution:
    - Removed H5F_ACC_CREAT from the function until the C library support it
    - Added H5F_ACC_RDONLY and H5F_ACC_RDWR to the comments to update the
      documentation
Platforms tested:
    Linux/ppc64 (ostrich)
    Linux/32 2.6 (jam)
    SunOS 5.11 (emu)