Installers created by IzPack use Java Logging for writing log entries and stacktraces to the console. The built-in behavior cannot be overridden by passing neither the java.util.logging.config.file nor java.util.logging.config.class system properties to the JVM at command line level, which breaks the Java Logging API.
Make it possible to use either
at command line level to be passed to the JVM for being able to override completely or partly
separately for package names like the Java Logging API defines.
Further allow to specify a log file on the installer command line and optionally configure it in install.xml.
Adding possibility of recursively creating parent dirs of the log file (default:false) at compile time.