bug: incorrect decode of query part

[Gustavo Sverzut Barbieri <gustavo barbieri indt org br>]

Hello,

When libsoup creates a new message it does call soup_uri_new_with_base(), 
which will find the query delimiter ('?') and then make this the uri->query 
member.

However when it does that it calls soup_uri_decode() on the entire query, 
which produces wrong results. It should, instead, split query on internal '&' 
demiliter and then convert both key and value.

How to check that: create a simple HTML GET-form that contains an text type 
input and type something like: "a=b&c=d". You should get "a%3Db%26c%3Dd" in 
your path in simple-httpd.c, but instead you get "a=b&c=d", which will mess 
scripts that will receive 3 pairs instead of 1.

some alternatives on how to solve that:
 a) do not mess with query
 b) convert query to a hash table of lists of strings, keys and list values 
both should be decoded.

I already have the code for b), so I'm ok with you providing just a) :-)

Thanks!

-- 
Gustavo Sverzut Barbieri
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