[Clipart] Use 7Zip for the Open Cliparts distribution

[Daniel Carrera]

Mourad Mokrane wrote:
> I think that spreading the 7z format would be a good idea at
> least because of one thing: it is open source.

So is zip and tar.gz  :-)

What 7z has going for it is a nice compression ratio. Historically this 
has been hampered by being bound to Windows, but it seems that might 
have changed recently.

> The main idea of Openclipart is the same, so I thing that
> hosting a 7z version of the package would fit in that philosophy.
> Of course keeping the other formats is a must.

All the other formats we use are just as open. And in a way, they're 
more open because they are also standard. As much as I love the cool 
LZMA algorithm, open-ness is not a reason to use it.

Cheers,
Daniel.