Quiet re-imports

[Diego]

I think it would be nice to have a flag/parameter to quiet "re-importing 
already imported identifier/syntax" warnings. These seem rather noisy, and in 
many cases the user is probably aware of potential collisions (as in (import 
r7rs), for example).

In the attached patch to modules.scm, I've quieted the warnings based on the 
load-verbose flag, but I don't think that's entirely appropriate as this 
warning is more to do with importing than loading (for example, you can (import 
r7rs), then (import scheme), which will issue the warnings even though scheme 
is already loaded).

Thoughts on any of this?

- Diego

0001-quiet-reimport.patch
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