templates/rss/error.tmpl

inotify: create a common, OS-independent server entry point

* rename server.py to linuxserver.py
* create server.py: it will contain OS-independent logic for servers, and will
  import the right server depending on the OS
* old server.server class is renamed to linuxserver.socketlistener

{header}
    <title>Error</title>
    <description>Error</description>
    <item>
      <title>Error</title>
      <description>{error|escape}</description>
      <guid>http://mercurial.selenic.com/#error</guid>
    </item>
  </channel>
</rss>