graphics/opendx and dropping science/hdf

[Mikhail Teterin]

Hello!

I intend to drop the science/hdf port. It was obsoleted by hdf5 long ago
(was it?), it breaks on some some 64bit platforms, it conflicts with
math/netcdf.

All the technical issues are, probably, fixable, but the obsoleteness
makes them not worth the effort. Or so it seems.

The only port relying on science/hdf is graphics/opendx and only if
WITH_HDF is defined. Unfortunately, opendx does not (yet?) support hdf5.

So...
	. Does hdf5 really obsolete hdf4?
	. Does hdf support add much value to opendx at all,
	  or can we just remove it?
	. If not, should I (or some other helping hand) try to patch
	  opendx to use hdf5?
		or
	. bring the old hdf4 into the 21st century (fixing the types,
	  depending on math/netcdf instead of building its own)?

Thanks for any ideas,

	-mi