Could we use something better than zip for the dmd package?

[Kagamin]

> If you're trying to have an archival format that pretty much 
> any computer can open out of the box, zip is the only option. 
> If you're restricting yourself to Linux computers specifically, 
> there are definitely more options, but Windows can only handle 
> zip files. For all other archival formats, the user has to 
> track down a program which can handle them. No, that's not 
> hard, but it _does_ raise the bar of entry somewhat, and 
> there's really nothing wrong with using zip.

Only Linux and Mac users complain here about lack of 7z support 
in their oses.