REL_39 (2020-12-12)
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* Maintenance release
* Add (required) Null Island (ZZZZ) to the intl APT database 
* Add Greenland to eur.rus DEM
* Add Indian ocean islands to zar.aus DEM
* Add Pacific ocean islands to usa.can DEM
* Performance improvements
* Clear issue: 58 - Precipitation color in HC theme
* Clear issue: 59 - FDroid icon issue hopefully resolved
* Release EFIS v6.1
* Release DMAP v6.1
* Release COMP v6.1

