Made a couple of functions in cChunk inline, this should speed up several block operations on chunks

Players should not spawn in the ground anymore.
When an entity was added to cWorld twice (which shouldn't happen actually), the server would crash when the entity is destroyed, this should be fixed now.

git-svn-id: http://mc-server.googlecode.com/svn/trunk@158 0a769ca7-a7f5-676a-18bf-c427514a06d6

source/cWorld.cpp

@@ -415,8 +415,8 @@ void cWorld::Tick(float a_Dt)
 		{
 			LOG("Destroy that entity! %i", (*itr)->GetUniqueID() );
 			cEntity* RemoveMe = *itr;
-			itr++;
-			AddToRemoveEntityQueue( *RemoveMe );
+			itr = m_pState->AllEntities.erase( itr );
+			m_pState->RemoveEntityQueue.push_back( RemoveMe ); 
 			continue;
 		}
 		(*itr)->Tick(a_Dt);