[IZPACK-1100] - Generate automatic xml file for console installers

This is to address: https://jira.codehaus.org/browse/IZPACK-1100

1. Generate the automatic installation files through console installation the same way we do for GUI
  - The AbstractPanels class generates the automatic installation
  - Console Panels use the associates AutomationHelpers just like the GUI Panels
2. Default named for automatic installation file generated by console is now "auto-install.xml" to be consistent with GUI installer