#131 setKillOnShutdownHook causes JVM to be stopped

[Nikolaj Weise]

A shutdown hook is set in BicepsClientFramework.setup():
FrameworkProperties.getInstance().setKillOnShutdownHook(true);

That shutdown hook terminates the JVM: Runtime.getRuntime().halt(0); (in SEToolkit.addShutdownHook())

We don't want to stop the JVM when exiting BICEPS and we want to be able to define an appropriate exit code.