hdf5 compat
hdf5 compat

H5Aexists was added in 1.8.0, c++ wrapper wasn't added until
sometime later.

frib-high-level-controls/FLAME,frib-high-level-controls/FLAME,frib-high-level-controls/FLAME,mdavidsaver/jmbgsddb,frib-high-level-controls/FLAME,mdavidsaver/jmbgsddb,frib-high-level-controls/FLAME,mdavidsaver/jmbgsddb,mdavidsaver/jmbgsddb,frib-high-level-controls/FLAME