Add dgs LevelsUp input. Refs #7787
Correct for Solid Angle option in DgsReduction diagnostic. Refs #7787

Also fixed SaveVanadium option to be visible in the auto-generated gui
Fix warning. Refs #7787
Try to fix systemtest. Refs #7787

It seems like python has problems with passing ints through property
manager. Switching to double
Override parameters in reduction properties. Refs #7787
Merge remote branch 'origin/feature/7787_DGSLevelUp'