I also contacted Avira to report a false positive for the latest version (0.20) and got the below response.
Ufasoft, if you want the miner to be trusted and used broadly please release the source for the latest version (current available version is 0.10) and build instructions/environment for windows/linux.
Dear Sir or Madam,
Thank you for your recent inquiry.
The submitted file does not show a false positive detection by AntiVir. It does indeed contain malicious behaviour, the detection is correct.
For further questions don't hesitate to contact us.
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Freundliche Gruesse / Best regards
Avira Operations GmbH & Co. KG