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_c_api.e

@@ -96,6 +96,15 @@ feature -- Output
 			"FCGI_fwrite($v, 1, $n, FCGI_stdout);"
 		end
 
+feature -- Error
+
+	put_error (v: POINTER; n: INTEGER)
+		external
+			"C inline use %"fcgi_stdio.h%""
+		alias
+			"FCGI_fwrite($v, 1, $n, FCGI_stderr);"
+		end
+
 feature -- Access
 
 	stdout: POINTER
@@ -114,6 +123,14 @@ feature -- Access
 			"FCGI_stdin"
 		end
 
+	stderr: POINTER
+			-- FCGI_stderr() return pointer on error FCGI_FILE
+		external
+			"C inline use %"fcgi_stdio.h%""
+		alias
+			"FCGI_stderr"
+		end
+
 note
 	copyright: "Copyright (c) 1984-2011, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"