[Jaring] Replace some icons and background images.

Conflicts:
	images/home/login/logo.png
	images/logo.png
	module/main/layout.css
[Jaring] Add and delete background images.
[Jaring] Fix the layout of home logo and main logo image.
[SDP-EXT] Add group 'KPR' and user 'kpr'.

* Fix login layout.
* WBP.Sterek: Add icon for buttons.