created first SwingWorker classes to replace DataLoadingThread
finished SwingWorker classes and propably shutdown delay
renamed some string resources acording to new classes; 
moved some dependant jars; 
added callbacks to SwingWorker; 
limit settings will be uploaded only after they are changed
rewritten export log for user information
moved native load of USBwrap to USBHandler constructor; 
removed last static GUI fields (updates via property changes/callbacks);
TaskbarInterface throws custom Exception if frame could not be found
Merge branch 'swingworker'

Conflicts:
	WetteranalyseWindows/.classpath
	WetteranalyseWindows/src/de/miktec/wetteranalyse/win/gui/GUIFrame.java
	WetteranalyseWindows/src/de/miktec/wetteranalyse/win/util/Settings.java
	WetteranalyseWindows/src/de/miktec/wetteranalyse/win/util/TaskbarInterface.java