mod_http_upload: Update compatibility information At least 0.9.x is broken due to use of util.jid.host, and I didn't check 0.10.x since that branch is also obsolete. Added info about mod_http_file_share.

<tr>
  <th>What is {x} {op} {y}?</th><td>
    <input name="captcha_challenge" type="hidden" value="{challenge}">
    <input name="captcha_reply" pattern="[0-9]+" required type="number">
  </td></tr>