Fine tunned modules scheme.

Adjusted client modules.
Fixed proxy bug in http.

test/dicttest.lua

@@ -0,0 +1,3 @@
+local dict = require"socket.dict"
+
+for i,v in dict.get("dict://localhost/d:banana") do print(v) end

test/tftptest.lua

@@ -1,5 +1,5 @@
 -- load tftpclnt.lua
-local tftp = require("tftp")
+local tftp = require("socket.tftp")
 
 -- needs tftp server running on localhost, with root pointing to
 -- a directory with index.html in it

test/urltest.lua

@@ -1,5 +1,5 @@
 local socket = require("socket")
-socket.url = require("url")
+socket.url = require("socket.url")
 dofile("testsupport.lua")
 
 local check_build_url = function(parsed)