Added a field in the activity where we can see the results from the locator algorithm.
Added a method in WifiSensor so that it is public to start a new scan. Servicehandler is cleaned up and timed methods are instanciated. As by now a scan is started each 1 minute. Two seconds after the algorithm starts and it may post changes to targets given the right conditions.
Fixed a minor error in OptionsMenu and added a comment.