preferred host can be also ip, implement unblockcs

From:
commit ac86e87635e59c66011107d890a53f8408910fd1
Author: Dirk Mueller <mueller@kde.org>
Date:   Wed Jul 16 20:44:45 2008 +0000

    - preferred host can also be the ip address
    - implement unblockcs

    svn path=/branches/work/icecream-make-it-cool/; revision=833456