Created sphere radiuses
Changes from Krzysiek P.: added timeToLive(alsoForever); improven rotation matrix: changed scaling(rad->ang) ,added angles;
Detecting collisions: step 1-radiuses and distance
minor changes
Merge branch 'collisions1' into gui_rewind

Conflicts:
	src/main/java/vpl/gui/AddObjectJPanel.java
	src/main/java/vpl/gui/gl/GLDrawingHandler.java