Some small cleanups for convert extension:
- repo doesn't need to be imported
- util.Abort doesn't need \n
- space after comma
- long lines
- spacing
#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#