close #18: change attribute, change formatting
#19: sync method onCreateOptionsMenu, onOptionsItemSelected
close #19, #16, #15, #20 -- merge code from pre-development
close #19, #16, #15, #20 -- merge code from pre-development
fix #21: use longitude formatting for longitude
#23 separate code for Progress Dialog in an extra class
close #24: move WSaveFile, WSeekableFile, WUI and WLocationService
close #25: use ScreenHelper instead of WUI to switch screen