hdf5_ep

[svn-r5595] 
Purpose:
    Bug #774 fix
Description:
    H5Tenum_valueof and H5Tenum_nameof functions did not fail
    when non-existing name or non-existing value were supplied.
    This happened because binary search algorithm did not check
    if value or name found during the search were equal to the supplied
    one.
Solution:
    Added an appropriate check condition.
Platforms tested:
    Solaris 2.7 and Linux 2.2.18