bookmarks: Set current bookmark if we create a new one on the tip
If track.current is enabled we set the newly created bookmark as the
current tracked bookmark. We do not do this if a revision is specified.
{header}
<title>Error</title>
<description>Error</description>
<item>
<title>Error</title>
<description>{error|escape}</description>
<guid>http://www.selenic.com/mercurial/#error</guid>
</item>
</channel>
</rss>