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* A coupke of stream allocator tweaks - Do not overshoot on catch up. It so happens that during probe the next higher layer is at some bit rate which is much lower than normal bit rate for that layer. But, by the time the probe ends, publisher has climbed up to normal bit rate. So, the probe goal although achieved is not enough. Allowing overshoot latches on the next layer which might be more than the channel capacity. - Use a collapse window to record values in case of a only one or two changes in an evaluation window. Some times it happens that the estimate falls once or twice and stays there. By collapsing repeated values, it could be a long time before that fall in estimate is processed. Introduce a collapse window and record duplicate value if a value was not recorded for collapse window duration. This allows delayed processing of those isolated falls in estimate. * minor clean up * add a probe max rate * fix max * use max of committed, expected for max limiting * have to probe at goal