hdf5

[svn-r17928] Description:
    In 1.8 & 1.9:  Add note that return value type changed in 1.8.0 and 
        an application must free the memory associated with the return 
        value to prevent a memory leak.
    In 1.8: Add note of change in 1.8.0 "Changes" section.
    In 1.6: Add note that an application cannot free the memory associated 
        with the return value.
    -- Fixes Bugzilla entry 1692.
Tested:  Safari