Don't abort when backup files already exist. Don't allow alternative names. Rationale: - When the user wants to revert, he shouldn't be stopped from doing this just because some old backups will be overwritten. - To not clobber important files by accident, alternative names for backup files were disabled. As the backup target now has a fixed name, the user doesn't have to be informed about the backup copy (unless --verbose)

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%% Should show unknown

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? unknown

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%% Should show unknown and b removed

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R b

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? unknown

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%% Should show a and unknown

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a

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unknown