implement "pretend" option, it just displays packages that would be downloaded and installed and exits
implement "pretend" option, it just displays packages that would be
downloaded and installed and exits


git-svn-id: 4b064e69dc630d28214c1e1442d27300cccf8e9a@178067 c90b9560-bf6c-de11-be94-00142212c4b1

DQNEO/PEAR_Exception