URL paths with %2F in them

The netstring/nethttp.ml implementation of uripath_decode fails with  
an error if a %2F (the URL encoding for '/') is encountered in the  
query string.  e.g.

Is there any reason to reject URLs with this or is it just not  
implemented/bug?  Several client libraries which encode URIs seem to  
do this replacement, and nethttpd fails against them.

The trivial replacement of fixing uripath_decode runs into the issue  
that some other callers call split_path _before_ doing the URL decode,  
and so the resulting string isn't split correctly.  So the patch is a  
little larger than just fixing the one function, so I figured I'd  
check with the list first...

-anil

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