db._user : add columns status and last_login.
module.home: Add wallpaper and logo to login screen.
Add extension jx.combogrid.

* module.init: import sql.Date and sql.Types.
Add extjs extensions.

* BoxReorder
* CheckCombo
* DataTip
* GridHeaderTooltip
* LiveSearchAddGridPanel
* LiveSearchGridPanel
* StatusBar
Update main layout.