Data Structures

Here are the data structures with brief descriptions:

Link	Stores data and pointers to next and previous links
LinkedList	Stores a linked list, with sentinel links for head and tail. These sentinels contain dummy values
NeighborList	For a given ordering, this stores later neighbors and earlier neighbors for a given vertex in linked lists
NeighborListArray	For a given ordering, this stores later neighbors and earlier neighbors for a given vertex in arrays