Start of more efficient wifi scanner
Merge branch 'master' into EfficientWifiScan

Conflicts:
	res/xml/preferences.xml
Merge branch 'master' into EfficientWifiScan
readd position find
Merge branch 'master' into EfficientWifiScan

Conflicts:
	src/de/uulm/mi/mind/service/WifiScannerService.java
allow alarm cancel
better setting titles
fix for ip setting
Scanner:
cancel on logout,
start on login
MainActivity: better timer handling
toast on status update
Show not connected on timeouts