Added a popularity ratio filter to filter on favorites per find.
Removed the constraint that only caches > 9 finds are handled and also
applied this change to the popularity ratio comparator.
Merge remote-tracking branch 'KiwiStone/popularity_ratio_filter'

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