hdf5_ep

[svn-r27943] Purpose: Fix HDFFV-7947 (cont.)
Description:
    In the friend functions that setId, changed the direct assignment of
    id to using p_setId() so that the previous id can be closed first to
    avoid memory leaks.
    This change was tested and confirmed by user Jorj on Forum when his
    application stopped running out of memory.  Currently, the C++ library
    doesn't have a way to test this.  A function such as H5Inmembers for
    library ids would be helpful.
Platforms tested:
    Linux/32 2.6 (jam)
    SunOS 5.11 (emu)
    Darwin (osx1010test)