Added keyboardUpCallback,

Thanks to Erik Weitnauer
http://code.google.com/p/bullet/issues/detail?id=215#c1

Fixed ccdMotionThreshold (wrongly squared input value)
Thanks to Mark Carlson for the report/fix.
http://code.google.com/p/bullet/issues/detail?id=216#c1

Demos/OpenGL/DemoApplication.h

@@ -198,6 +198,8 @@ public:
 
 	virtual void keyboardCallback(unsigned char key, int x, int y);
 	
+	virtual void keyboardUpCallback(unsigned char key, int x, int y) {}
+	
 	virtual void specialKeyboard(int key, int x, int y){}
 
 	virtual void specialKeyboardUp(int key, int x, int y){}

Demos/OpenGL/GlutStuff.cpp

@@ -27,6 +27,11 @@ static	void glutKeyboardCallback(unsigned char key, int x, int y)
 	gDemoApplication->keyboardCallback(key,x,y);
 }
 
+static	void glutKeyboardUpCallback(unsigned char key, int x, int y)
+{
+  gDemoApplication->keyboardUpCallback(key,x,y);
+}
+
 static void glutSpecialKeyboardCallback(int key, int x, int y)
 {
 	gDemoApplication->specialKeyboard(key,x,y);
@@ -82,6 +87,7 @@ int glutmain(int argc, char **argv,int width,int height,const char* title,DemoAp
     gDemoApplication->myinit();
 
 	glutKeyboardFunc(glutKeyboardCallback);
+	glutKeyboardUpFunc(glutKeyboardUpCallback);
 	glutSpecialFunc(glutSpecialKeyboardCallback);
 	glutSpecialUpFunc(glutSpecialKeyboardUpCallback);
 

src/BulletCollision/CollisionDispatch/btCollisionObject.h

@@ -393,7 +393,7 @@ public:
 	/// Don't do continuous collision detection if the motion (in one step) is less then m_ccdMotionThreshold
 	void	setCcdMotionThreshold(btScalar ccdMotionThreshold)
 	{
-		m_ccdMotionThreshold = ccdMotionThreshold*ccdMotionThreshold;
+		m_ccdMotionThreshold = ccdMotionThreshold;
 	}
 
 	///users can point to their objects, userPointer is not used by Bullet