Sparse nauty#10

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jesselansdown wants to merge 2 commits intogap-packages:masterfrom

jesselansdown:SparseNauty

Commits on Mar 2, 2018

Added sparse graph functionality. Options to convert dense graphs to sparse, and print both sparse and dense graphs as a test
jesselansdown
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Added NAUTY_SPARSE and NautySparse
jesselansdown
committed