Remove unused fields from DataFile. #914
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This removes
file_ordinalandsort_columns.The file ordinal has never been used and would need to be replaced because an ordinal is no use without context for which file ordinals were part of a single sort.
Sort columns has also never been used and will be replaced by a sort order ID with the sort order defined in table metadata. This is smaller and can handle more complex ordering specs that include null handling, ascending/descending, transforms, etc.