Updated filemenu screenshot.
Adding DefaultExceptionHandler to other newly created threads.
Catching errors during error dialog creation.
WIP: Java 7 seems to have changed error catching on the event dispatch thread.
Java 7 does not respect system property "sun.awt.exception.handler". But the handler can now be set by "setUncaughtExceptionHandler".
Merge branch 'error-dialog' into pre-R3