hdf5_ep

[svn-r25653] Purpose: Fixed HDFFV-4259
Description:
    - Used H5I_INVALID_HID instead of 0 to initialized member "id" in classes
      that represent HDF5 objects.  For PropList, H5P_DEFAULT has to be used
      instead of H5I_INVALID_HID.
    - Added try/catch block to some dynamically allocating memory code and
      re-throw the bad_alloc exception with a message informing the location of
      the failure.
    (merged from trunk-r25640)

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
    (merged from trunk-r25632)

Platforms tested:
    Linux/ppc64 (ostrich)
    Linux/32 2.6 (jam)
    SunOS 5.11 (emu)