big changes (again)

Signed-off-by: Dominik Beppler <dbeppler@web.de>
Merged.

Signed-off-by: Dominik Beppler <dbeppler@web.de>
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/geometries/BorderedBoundingBoxCalculator.java
	src/geometries/BoundingBoxCalculator.java
	src/geometries/GraphicalNode.java
	src/geometries/Line.java
	src/geometries/Polyline.java
	src/geometries/Rectangle.java
	src/geometries/Text.java
	src/geometries/TightBoundingBoxCalculator.java
	src/gui/MainFrame.java