Improve error message for unknown revlog flags.
Old: unknown flags 120000 for ...
New: unknown flags 0x0012 for ...
#header#
<title>Mercurial repositories index</title>
</head>
<body>
<h2>Mercurial Repositories</h2>
The specified repository "#repo|escape#" is unknown, sorry.
Please go back to the main repository list page.
#footer#