Merge branch 'feature/fix-cgsolver-reduction' into 'master'

[preconditioners] fix type of CGSolver reduction parameter after recent updates

See merge request !132 (merged)

(cherry picked from commit 676d3a38)

6e85bbd7 [preconditioners] fix type of CGSolver reduction parameter after recent updates

enabled an automatic merge when the pipeline for 1bff6784 succeeds

Wahrscheinlich ist es besser, wenn nur einer von uns das cherry-picking macht - sonst kommen wir uns nur in die Quere (ich hab schon zwei merge requests wieder zu gemacht :-)

merged

mentioned in commit f355cd4c