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)
<table class="changelogEntry parity#parity#">
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<th class="age" width="15%">#date|age# ago:</th>
<th class="firstline">#desc|strip|firstline|escape#</th>
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<th class="changesetRev">changeset #rev#:</th>
<td class="changesetNode"><a href="?cs=#node|short#">#node|short#</a></td>
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#parent%changelogparent#
#child%changelogchild#
#changelogtag#
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<th class="author">author:</th>
<td class="author">#author|obfuscate#</td>
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<tr>
<th class="date">date:</th>
<td class="date">#date|date#</td>
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<tr>
<th class="files"><a href="?mf=#manifest|short#;path=/">files</a>:</th>
<td class="files">#files#</td>
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