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

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<table class="slogEntry parity#parity#">

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 <tr>

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  <td class="age">#date|age#</td>

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  <td class="author">#author|obfuscate#</td>

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  <td class="node"><a href="#url#rev/#node|short#{sessionvars%urlparameter}">#desc|strip|firstline|escape#</a></td>

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 </tr>

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</table>