+ copying commit_list_compare_by_committer_date for author_date
+ re-naming the old function to copy it to a new one ... again
+ copying parse_commit_date for author_date
+ ... now that we have commit->author_date,
+ revert "+ re-naming the old function to copy it to a new one"

This reverts commit 1476dde7f509e33fa76f82d22f339bd91112ad01.
+ copying commit_list_sort_by_date and commit_list_insert_by_date
+ adding use_author to the rev_info struct, and sort_in_topological_order calls
+ updating localizations and contribs
+ adding a flag to trigger use_author!