Geohash Droid

- You can now specify a separate Known Location notification radius for globalhashes.
- Fixed the whole thing where if you tried to go directly to the prefetch preference from the dialog in Known Locations, it just went to the main preferences screen instead of Other.
- Known Location notification ranges now go up to 200km.
- Added a link to the app's device-wide notification settings in the "Other" section of preferences.