[Nexus] Reading generic h5 files.

[tieman]

Mark,
> On the other hand I think (no guarantees though) it suffices to add a 
> NX_class attribute to all groups except / in those non standard HDF-5 
> files. The
> file attributes are only written by the API when a new file is opened 
> but never checked after that.
>
>   
We're working to try and verify this but it might take a few days to get 
to it.  If it works, we're back in business!

Thanks!

Brian