Revert "io.hdf5: use native h5py file check"

This reverts commit 5b565042b41d3088801f2b3876a08568754821e4.
io.hdf: fix version problem with HLObject
StateVector.__init__: forward kwargs
timeseries.common: fix LIGOTimeGPS division bug
timeseries.io.hdf5: add StateVector