LBCLASSIC-54

 	 
- Heavy refactoring of TurboFilters 
  TurboFilters are now collected in a CopyOnWriteArrayList which is
  ensures safe access even if the turbo filter list is modified during
  the lifetime of the application
  
  Added test cases to ensure that performance does not degrade in an
  uncontrolled fashion
  
  More cleaning up to follow