Not all files are removed on installation quit.

Description of problem:
Sometimes when post installation steps are made and the installation is interrupted by the user using 'Quit', then not all installer-created files are remove. One of IzPack installation summary and log files was left behind.

Please see the attached stack-trace which was present when the situation occurred. I hope that should be sufficient to determine what cleanup is missing.

Version-Release number of selected component (if applicable):
6.0.2.CR1

How reproducible:
Very hard.

Steps to Reproduce:
1. Run the installer and end the installation using 'Quit' when post installation steps are performed.