range_search_2d is faster now for counting queries#424
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When the weight range [a,b] is entirely within the query range [p,q], it is not necessary to go all the way down to$\lg{\sigma}$ levels inside
_range_search_2d-- the 3-line additional check speeds up counting (of course, not reporting -- for reporting we need to recover the weights bottom-up) queries few times, on reasonably large datasets.