removes redundant comments from common.css
adds script for View_Date
edits View_Date.js and View_Date to use script
changes div id and name in View_Rank::selector()
changes div names in modules/users/list.php
changes users/main to use new div names
Adds Model_Dao::_update() and _var_to_columns()
modules/users/main uses new _update method for user editing
removes redundant query from modules/user/main.php