Refactor occupancy_t type to reduce memory allocations#296
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This commit replaces the occupancy_t type's logical array components that were dimensioned to cover the tensor-component space for purposes of tracking each bin's occupation. The replacement component stores the component-space location of only the occupied bins.
This commit stores the number of occupied bins separately from the occupied bins list so that the list can be longer when necessary in order to reduce the number of memory allocations over the course of runs.
This commit doubles the occupied-bin list in size when adding a bin requires a longer list. Now growing the list to size N, requires only log_2(N) memory allocations instead of N allocations.
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This PR
occupancey_ttype in order to support refactoring itoccupancy_ttype to store the number of occupied bins separately from the occupied-bins array so the array can be longer than the number of occupied bins when necessaryNow the occupied-bin array doubles in size whenever the addition of a new bin requires a longer list. This implies that growing the list to size N requires only$$log_2(N)$$ memory allocations instead of N allocations.