Fix bug in interval tree - #25
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The interval tree is structured differently to an R-tree. Intervals cross a node's centre are stored on its parent. Thus, the set of intervals at some level of the tree had gaps in it. Now, collect_intervals returns a set which completely covers the interval.
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For an interval tree, intervals across a node's centre are stored on its parent. Thus, the set of intervals at some level of the tree had gaps in it.
collect_intervalsnow returns a covering set of intervals