Version 8.21

[kitercuda]

- Corrected Czech small airport database, added VHFs
- Remove crash when open Terrain map downaload manager
- Support for PDF airport information (for more information see http://www.funair.cz/forum topis Questions and answers
- ICAO code is displayed in nav item list
- Possible ILS approach to RWY nav item (Long tap at RWY then select ILS approach)