Fixed over 500 compile warnings. Mostly:

* Unused variables.
* Missing newlines at ends of #included files.
* signed int loop variables where the termination condition is an unsigned 'get number of' function.
* 'NULL' used inappropriately for an integer or character constant (NULL is a pointer)
* abstract base classes with no virtual destructor.
* Floating point constants used to initialise integer variables.

BulletDynamics/ConstraintSolver/Generic6DofConstraint.cpp

@@ -243,6 +243,7 @@ SimdScalar Generic6DofConstraint::ComputeAngle(int axis) const
 			angle = SimdAtan2( s, c );
 			}
 			break;
+                  default: assert ( 0 ) ; break ;
 		}
 
 	return angle;