Teach bdiff to support buffer objects
manifest.add gives revlog.addrevision a buffer object, which may
be cached and used for a second call in the same session (as mq does
when pushing multiple patches). The other option would be to cast the
buffer to str when caching it.
#header#
<title>Mercurial Error</title>
</head>
<body>
<h2>Mercurial Error</h2>
<p>
An error occured while processing your request:
</p>
<p>
#error|escape#
</p>
#footer#