Fix unalligned access and read float43 value (it was casted as double)
Fix unalligned access and read float43 value (it was casted as double)

HDF-NI/hdf5.node,ryancole/hdf5.node,ryancole/hdf5.node,HDF-NI/hdf5.node,ryancole/hdf5.node,HDF-NI/hdf5.node