guile-www patches

[Clinton Ebadi]

I have two patches for http.scm and cgi.scm. I changed make-shared-substring 
into substring because make-shared-substring is deprecated, fixed the use of 
bound? in cgi.scm (instead I have to optional values default to #f), and made 
cgi.scm use #:key instead of #&key.


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cgi_patch
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http_patch
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