[ET Trac] [Einstein Toolkit] #892: correct column headers hen both one_file_per_group and all_reductions_in_one_file are active

#892: correct column headers hen both one_file_per_group and all_reductions_in_one_file are active --------------------+------------------------------------------------------- Reporter: rhaas | Owner: eschnett Type: defect | Status: new Priority: minor | Milestone: Component: Carpet | Version: Keywords: | --------------------+------------------------------------------------------- the column labels were sorted the wrong way if both options were active (nesting of loops was wrong). The attached patches correct this and add test cases for all 4 combinations of one_file_per_group and all_reductions_in_one_file.