some changes
	modified:   eZLib/nbproject/project.properties
	modified:   eZLib/src/eZLib/Physics/Body.java
	modified:   eZLib/src/eZLib/Physics/Force.java
	modified:   eZLib/src/eZLib/Physics/Friction.java
	modified:   eZLib/src/eZLib/Physics/Gravity.java
	deleted:    eZLib/src/eZLib/Physics/Motion.java
	deleted:    eZLib/src/eZLib/Physics/Wind.java
	modified:   eZLib/src/eZLib/Study/ForceSketch.java
	modified:   eZLib/src/eZLib/Study/SolarSystem/SunSysSketch.java