Some minor fixes to the DFT+U code.

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.

changed milestone to %9.0

added Bug label

marked the checklist item I have checked that my code follows the Octopus coding standards as completed

marked the checklist item I have added tests for all the new features added in this request. as completed

Codecov Report

Merging #461 into develop will decrease coverage by <.01%. The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop     #461      +/-   ##
===========================================
- Coverage    68.05%   68.04%   -0.01%     
===========================================
  Files          454      454              
  Lines        84041    84044       +3     
===========================================
  Hits         57190    57190              
- Misses       26851    26854       +3

Impacted Files	Coverage Δ
src/scf/mix_inc.F90	78.32% <0%> (-0.3%)
src/basis_set/loewdin_inc.F90	64.64% <0%> (-1.34%)

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merged