Description

Some minor fixes to the DFT+U code:

Fix linear mixing of auxiliary quantities when they have a different type from the main quantities.
Fix DFT+U when running in debug mode.

News snippet

Minor fixes to the DFT+U code.

Checklist

I have checked that my code follows the Octopus coding standards
I have added tests for all the new features added in this request.

Edited Mar 20, 2019 by Micael Oliveira