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/libfcgi/implementation/linux/fcgi_imp.e

@@ -77,6 +77,18 @@ feature -- FCGI output
 			{FCGI_C_API}.put_string (l_c_str.item, l_c_str.count)
 		end
 
+feature -- Error		
+
+	put_error (a_message: READABLE_STRING_8)
+			-- Put error message `a_message' on the FastCGI stderr
+		local
+			l_c_str: C_STRING
+		do
+			l_c_str := c_buffer
+			l_c_str.set_string (a_message)
+			fcgi.put_error (l_c_str.item, l_c_str.count)
+		end
+
 feature -- FCGI Input
 
 	copy_from_stdin (n: INTEGER; tf: FILE)