Fixed various unicode issue related to query and form parameters.

(Especially for the multipart/form-data encoding.)
Factorized code related to smart parameters computing (handling list , table, ...) in WSF_VALUE_UTILITIES.
Fixed an issue with percent_encoded_path_info computation from request_uri.
Fixed issue with cookie addition having same cookie name.
Fixed unicode support for uploaded file.
WSF_STRING is reusing WSF_PERCENT_ENCODER.
Use unicode output for WSF_DEBUG_HANDLER.
Code cleaning

library/server/wsf/extension/handler/wsf_debug_handler.e

@@ -59,6 +59,7 @@ feature -- Access
 
 			create dbg.make
 			dbg.set_is_verbose (True)
+			dbg.set_unicode_output_enabled (True)
 			dbg.append_cgi_variables_to (req, res, s)
 			dbg.append_information_to (req, res, s)
 

library/server/wsf/extension/wsf_debug_information.e

@@ -42,6 +42,9 @@ feature -- Settings
 	is_verbose: BOOLEAN
 			-- Has verbose output (default: True)?
 
+	unicode_output_enabled: BOOLEAN
+			-- Display names and values as unicode.
+
 feature -- Settings change
 
 	set_is_verbose (b: BOOLEAN)
@@ -50,6 +53,12 @@ feature -- Settings change
 			is_verbose := b
 		end
 
+	set_unicode_output_enabled (b: BOOLEAN)
+			-- if `b' then enable unicode output, otherwise disable.
+		do
+			unicode_output_enabled := b
+		end
+
 feature -- Execution
 
 	append_connector_informations_to (req: WSF_REQUEST; res: WSF_RESPONSE; a_output: STRING)
@@ -232,7 +241,7 @@ feature {NONE} -- Implementation
 						it as c
 					loop
 						s.append ("  - ")
-						s.append (utf.escaped_utf_32_string_to_utf_8_string_8 (c.key))
+						append_unicode (c.key, s)
 						s.append_character (' ')
 						if attached c.item as l_item then
 							s.append_character ('{')
@@ -302,7 +311,11 @@ feature {NONE} -- Implementation
 						it as c
 					loop
 						a_output.append ("  - ")
-						a_output.append (c.item.url_encoded_name)
+						if unicode_output_enabled then
+							append_unicode (c.item.name, a_output)
+						else
+							a_output.append (c.item.url_encoded_name)
+						end
 						t := c.item.generating_type
 						if t.same_string ("WSF_STRING") then
 						else
@@ -313,15 +326,15 @@ feature {NONE} -- Implementation
 						end
 						a_output.append_character ('=')
 						if attached {WSF_STRING} c.item as l_str then
-							s := l_str.url_encoded_value
+							if unicode_output_enabled then
+								s := l_str.value
+							else
+								s := l_str.url_encoded_value
+							end
 						else
 							s := c.item.string_representation
 						end
-						if s.is_valid_as_string_8 then
-							v := s.as_string_8
-						else
-							v := utf.escaped_utf_32_string_to_utf_8_string_8 (s)
-						end
+						v := utf.utf_32_string_to_utf_8_string_8 (s)
 						if v.has ('%N') then
 							a_output.append (eol)
 							across
@@ -349,7 +362,6 @@ feature {NONE} -- Implementation
 		local
 			n: INTEGER
 			v: READABLE_STRING_8
-			utf: UTF_CONVERTER
 		do
 			if is_verbose then
 				a_output.append (a_title)
@@ -368,11 +380,7 @@ feature {NONE} -- Implementation
 						it as c
 					loop
 						a_output.append ("  - ")
-						if c.key.is_valid_as_string_8 then
-							a_output.append (c.key.as_string_8)
-						else
-							a_output.append (utf.utf_32_string_to_utf_8_string_8 (c.key))
-						end
+						append_unicode (c.key, a_output)
 						a_output.append_character ('=')
 						v := c.item
 						if v.has ('%N') then
@@ -398,6 +406,17 @@ feature {NONE} -- Implementation
 			end
 		end
 
+	append_unicode (s: READABLE_STRING_GENERAL; a_output: STRING)
+		local
+			utf: UTF_CONVERTER
+		do
+			--if s.is_valid_as_string_8 then
+				--a_output.append (s.as_string_8)
+			--else
+				a_output.append (utf.utf_32_string_to_utf_8_string_8 (s))
+			--end
+		end
+
 feature -- Constants
 
 	eol: STRING = "%N"