Model/DBQuery.php
htdocs/drawing/Controller/updateHandler.php
htdocs/drawing/index.php
htdocs/drawing/js/update.js
	add and revise the program flow for hanlding "update drawing request"

htdocs/drawing/Controller/download.php
	handle download request

*.bat, *.ps1
	for backup, restore and public (copy development folder to public folder) issues