Navbar movable to left, right or middle

	modified:   core/java/android/provider/Settings.java
	new file:   packages/SystemUI/res/layout-sw600dp/left_navigation_bar_land.xml
	modified:   packages/SystemUI/res/layout-sw600dp/navigation_bar.xml
	new file:   packages/SystemUI/res/layout-sw600dp/right_navigation_bar_land.xml
	modified:   packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	modified:   packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java