fix handling of multiple Content-type headers
This can happen if an error happens while sending
application/mercurial-0.1 content. The error page will
be sent resulting (for at least lighttpd) in the following
headers:
Content-type: application/mercurial-0.1
Content-type: text/html
which result in req.proto = 'application/mercurial-0.1, text/html'
fix issue344
#header#
<title>#repo|escape#: tags</title>
<link rel="alternate" type="application/rss+xml"
href="#url#rss-tags" title="RSS feed for #repo|escape#: tags">
</head>
<body>
<div class="buttons">
<a href="#url#log{sessionvars%urlparameter}">changelog</a>
<a href="#url#shortlog{sessionvars%urlparameter}">shortlog</a>
<a href="#url#file/#node|short#/{sessionvars%urlparameter}">manifest</a>
<a type="application/rss+xml" href="#url#rss-tags">rss</a>
</div>
<h2>tags:</h2>
<ul id="tagEntries">
#entries%tagentry#
</ul>
#footer#