Fixed issues on Android 2.3.3:
* Data importing (manually doing any reload action - e.g. clicking the clear button of a filter - is still needed to refresh the imported data)
* Getting set and unset filters correctly
Fixed a crash bug when a previously selected filter is unselected and the list gets shorter, so that the old position is no longer valid
Modularized import service to be general enough for all import tasks
Fixed crash when EGOCursorLoader is created in Main activity while import is still running and database locked
Added Admittance Importer incl. associated preference
Modified admittance database table to only include one takeover time per day
Modified Importer return values to match named constants instead of magic values
Re-renamed app to "EGO", but show full name in About activity (shorter in Launcher and Title Bar)
Fixed About activity compatibility with oder Android versions < Honeycomb
Replace placeholder of navigation Intent preference also on older Android versions