@Tyriar

Since the old linkifier is gone, Buffer.iterator (and subsequentially BufferStringIterator and Buffer.stringIndexToBufferIndex) is not used by any code anymore. I think it can be removed. Also it is not exposed to outside, furthermore I think that this Java-ish iterator was not the best idea. (In case we want a similar feature in the future, maybe it could be achieved more idiomatic by a generator pattern.)