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

[Einstein Toolkit]

#892: correct column headers hen both one_file_per_group and
all_reductions_in_one_file are active
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 Reporter:  rhaas   |       Owner:  eschnett
     Type:  defect  |      Status:  new     
 Priority:  minor   |   Milestone:          
Component:  Carpet  |     Version:          
 Keywords:          |  
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 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.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/892>
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