Added comment about bad design choice of putting the stack in the set. Going back to original design with the stacks in vectors and an index in the PartitionWall set.
Added comment about bad design choice of putting the stack in the set. Going back to original design with the stacks in vectors and an index in the PartitionWall set.

cmcantalupo/SorterDist,cmcantalupo/SorterDist,cmcantalupo/SorterDist