* AbstractOperation.toString() now prints out also additional Parameters, if any

 * ApproxKNNOp now properly works with its Arguments (and uses standard toString()) 
 * Algorithm processOPeration now puts an "output" parameter "OperationTime" to processed operation
 * MultipleOverlaysAlgorithm.setThreadPool now does not share the pool with the inner algorithms any more
 * fix in SortedCOllection - internal fields are now "volatile"