added support for channel mirrors
added support for channel mirrors

<?xml version="1.0" encoding="UTF-8" ?>
<server>
  <name>pear.pirum-project.org</name>
  <summary>Pirum PEAR channel</summary>
  <alias>pirum</alias>
  <url>http://pear.pirum-project.org</url>
  <mirror>http://fr.pear.pp.org</mirror>
  <mirror>https://secure.pear.pp.org</mirror>
</server>

fabpot-graveyard/Pirum,fabpot-graveyard/Pirum,horde/Pirum,gencer/Pirum,gencer/Pirum,mortond1/Pear