Implemented WSF_RESPONSE.put_error (...) and related

Added WSF_RESPONSE.put_character
Renamed  WGI_OUTPUT_STREAM.put_character_8 as put_character  to follow style of put_string  (and not put_string_8)
Refactored the WSF_DEFAULT_SERVICE_LAUNCHER
Added WSF_DEFAULT_SERVICE to be more user friendly
Splitted the wsf/default/ libraries to have wsf/connector/... and being able to handle more than one connector in the same application

library/server/ewsgi/connectors/libfcgi/src/wgi_libfcgi_connector.e

@@ -20,8 +20,8 @@ feature {NONE} -- Initialization
 		do
 			service := a_service
 			create fcgi.make
-			create {WGI_LIBFCGI_INPUT_STREAM} input.make (fcgi)
-			create {WGI_LIBFCGI_OUTPUT_STREAM} output.make (fcgi)
+			create input.make (fcgi)
+			create output.make (fcgi)
 		end
 
 feature -- Access
@@ -63,7 +63,7 @@ feature -- Execution
 		do
 			if not rescued then
 				create req.make (vars, a_input, Current)
-				create res.make (a_output)
+				create res.make (a_output, a_output)
 				service.execute (req, res)
 			else
 				if attached (create {EXCEPTION_MANAGER}).last_exception as e and then attached e.exception_trace as l_trace then
@@ -84,10 +84,10 @@ feature -- Execution
 
 feature -- Input/Output
 
-	input: WGI_INPUT_STREAM
+	input: WGI_LIBFCGI_INPUT_STREAM
 			-- Input from client (from httpd server via FCGI)
 
-	output: WGI_OUTPUT_STREAM
+	output: WGI_LIBFCGI_OUTPUT_STREAM
 			-- Output to client (via httpd server/fcgi)
 
 feature {NONE} -- Implementation

library/server/ewsgi/connectors/libfcgi/src/wgi_libfcgi_output_stream.e

@@ -11,6 +11,8 @@ class
 inherit
 	WGI_OUTPUT_STREAM
 
+	WGI_ERROR_STREAM
+
 	HTTP_STATUS_CODE_MESSAGES
 		export
 			{NONE} all
@@ -68,6 +70,12 @@ feature -- Basic operation
 			fcgi.put_string (s)
 		end
 
+	put_character (c: CHARACTER_8)
+			-- Send `c' to http client
+		do
+			fcgi.put_string (c.out)
+		end
+
 feature -- Basic operations
 
 	flush
@@ -75,6 +83,13 @@ feature -- Basic operations
 		do
 		end
 
+feature -- Error
+
+	put_error (a_message: READABLE_STRING_8)
+		do
+			fcgi.put_error (a_message)
+		end
+
 feature {NONE} -- Implementation
 
 	fcgi: FCGI