hdf5_ep

[svn-r7080] Purpose:
    Bug fix (backward compatibility)

Description:
    Changes we've made during development of the 1.5.x branch had broken the
    feature of allowing user's callbacks to H5Giterate to return a value
    through the library back to the application which called H5Giterate.

Solution:
    Correctly pass along iterator callback return value and adjust internal
    library code to conform to this design.

Platforms tested:
    FreeBSD 4.8 (sleipnir)
    h5committest