docs for some price-quotes.scm functions?

[Christian Stimming]

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Hi Rob,

I just discovered the file src/scm/price-quotes.scm . Gee, why do we 
always talk about the pricedb, but there's nowhere a link to all the 
functions in this file? :-)) IMHO at some level (and maybe at a later 
point in time) the gnc-price wrappers, the pricedb, and a weighted average 
should be accessible under a unified API. 

For now I have some questions about the functions in price-quotes.scm. 
gnc:fq-get-quotes is nicely documented, and I'll play around with that 
soon. But there are two more functions, (gnc:book-add-quotes book) and 
(gnc:add-quotes-to-book-at-url url). What is their purpose? What are their 
arguments? What are their return values? I know, I could as well parse the 
whole scheme code and figure it out by myself, but it's much faster if you 
just say it :>

Christian
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