Ensure the the .installationinformation file is removed with the
uninstaller if it has been written.
Modify core method that generates the automatic installation file to
ensure that the uninstaller will delete it if it is placed within the
installation path. We will not try and delete the autoamtic installation
file if the user has decided to place it in some other location.
Updated message on failed files/directories to be removed. Now informs
the user why a directory might not have been able to be removed.
Merge pull request #258 from mtjandra/IZPACK-1150

[IZPACK-1150] - Uninstaller should properly handle .installationinformation and auto-install file