[Chicken-users] Snowtar C5 patch

[Diego]

Snowtar seems like a useful tool to have. I've made the appropriate C5 
compatibility changes (mostly just an egg file and cond-expands for imports), 
it'd be nice to have this in the C5 repo. I don't think I can actually push 
these changes upstream myself, or change the release-info file either, so I'm 
including a patch with my changes attached to this message. Hopefully someone 
with access can help me out here?

I may also port over snowdigest. Additionally, if anyone knows of a mirror for 
scheme now! packages/code, I'd love to explore these and package some up for C5 
(I'm awaiting on a response from the person who maintained the website, as far 
as I can tell). Looking on web archive, there's some pretty fun and interesting 
sounding stuff in there. Maybe we could create a snow compatibility egg to 
avoid code duplication across snow eggs.

- Diego

snowtar.patch
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