Make downsample/upsample accept WCS

[astrofrog]

No description provided.

[josePhoenix]

I would be interested in this, if this package is still being developed.

[pllim]

From the discussions in #44, I don't think this repo is active anymore.

[astrofrog]

@josePhoenix - I think that downsample/upsample are now in the core package, and are called block_replicate and block_reduce - but I think we still need to add the WCS support

[pllim]

@mcara implemented some form of basic WCS transformation for shrinking in scale_image() function in stginga.utils module, in case you find that interesting.

[larrybradley]

Yes, @astrofrog is correct. I added block_reduce and block_replicate to astropy.nddata.utils, but they do not preserve WCS. I recall it wasn't so trivial to preserve WCS distortions (but it may be easy now with gwcs).

[larrybradley]

Also, @pllim is correct. This repo is dead and should be removed once we migrate any remaining issues to the astropy issue tracker.....