[PATCH] Add string-replace-substring to (ice-9 string-fun)

[lloda]

This patch adds string-replace-substring that wingo posted to the mailing list 
to (ice-9 strings). This is a commonly used function and a good implementation 
isn't trivial, so I think it deserves inclusion.

0001-Add-string-replace-substring-to-ice-9-string-fun.patch
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