Added a popularity filter that allows to filter out caches that have more
then a predefined number of favorite points
Renamed the tts_ strings by cutting the leading tts_
Chnaged dsplay units to favorites and Favoriten (de).
Merge remote-tracking branch 'KiwiStone/popularity_filter'

Conflicts:
	main/res/values/strings.xml
	main/src/cgeo/geocaching/filter/FilterUserInterface.java