Fix error on deletion of last book in last language
remove support for Android 2.1
remove old buttonbar style
Adjust day theme, change bar theme if day/night
Hide Actionbar on startup screen
Temporary hack to prevent v11n mapping failure
Improve ui update thread management wrt bar
add sensor comments due to problems with 2.2 emulator
Fix: rotation caused actionbar items to disappear: remove CrWr AV repo