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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<title>#repo|escape#: #file|escape# annotate</title>
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<a href="?tags=">tags</a>
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<h2>Annotate #file|escape#</h2>
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<td class="metatag">changeset #rev#:</td>
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<td>#date|date# (#date|age# ago)</td></tr>
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<td>#permissions|permissions#</td></tr>
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