disable help text by default in AllBulletDemos (text slows down many graphics cards)

improve CollisionDemo.cpp, show multi-contact generation using perturbation
improve ColladaConverter: add hinge/point 2 point constraint conversion support, add btScaledTriangleMeshShape support
Fix Dynamica MayaPlygin: remove 'active' flag, it has to be replaced by mass=0 for active, mass<>0 for passive
Added missing projectfiles
Fixed single-shot contact generation. it is disabled by default to improve performance
Bugfixes for character controller, thanks to John McCutchan for reporting
Constraint solver: better default settings
btDefaultAllocator: aligned allocator uses non-aligned allocator (instead of directly malloc/free)
disable memalign by default, use Bullet's aligned allocator

src/BulletCollision/NarrowPhaseCollision/btPersistentManifold.cpp

@@ -183,6 +183,9 @@ int btPersistentManifold::addManifoldPoint(const btManifoldPoint& newPoint)
 
 		
 	}
+	if (insertIndex<0)
+		insertIndex=0;
+
 	btAssert(m_pointCache[insertIndex].m_userPersistentData==0);
 	m_pointCache[insertIndex] = newPoint;
 	return insertIndex;