EPIC: Reduce dynamic memory use by K_{3,3} search

[john-boyer-phd]

When using the memory checking tool developed for #59, we noted that frequent heap checking (MallocCheckHeapEach set to 6) causes the K_{3,3} search to run substantially slower than the other extensions. This suggests that the implementation uses dynamically allocated memory during its execution. It would be good to look through the code to find those allocations and make some stories here to convert them to allocations during gp_InitGraph() and similar locations so that there is less memory churn during algorithm execution.