finally beginning to introduce wifi stuff
preparing database access methods for wifi
some wifi functionality is visible and seems to be working, yet still
there is much work to be done
more wifi preparations - there are already wifi sightings, but not yet
sessions, nor database entries
* tracked down a bug that caused the wifiOn-setting not to be restored
* made buttons a little bit bigger
* increased database version to 4, thus from now on there should be wifi
data collection, but no visualization as of yet
* added Settings.toString
removed tvLabel to make room for more buttons
refactoring existing buttons to prepare for coming wifi buttons
more ui tweaking to accomodate new buttons (coming soon) for wifi stuff
added db methods to get max id from wifi sessions and sightings tables
added buttons for wifi listings, no onClick-handling yet
introducing new list layouts for displaying wifi stuff
more work on displaying the wifi information that is already being
collected
further steps in ui development for wifi information
more wifi ui work, removed settings menu items
more work on ui for wifi
trying to introduce alternate coloring of list items to better
distinguish between lines
fixed alternate coloring of list items