Account Tracker / Hill Lists / Meter Readings

Added more options for exporting readings and backup files, e.g. using AirDrop or directly to other apps.

Added a workaround for an iOS issue where the wrong decimal separator is used in the iPhone decimal number keypad. This prevented some users from entering detailed rates.

Note that you now require iOS 9 or above. Older versions (of iOS and the app) should continue to work, but you will no longer get updates.