moving hypergraph utility functions into separate file #54

Job	Run time
Build (Release)	2m 24s
Build (Debug)	4m 8s
Build (RelWithDebInfo-noEigen)	5m 40s
Build (RelWithDebInfo)	4m 43s
Build & Test (RelWithDebInfo + Eigen)	7m 8s
Build & Test (RelWithDebInfo, no Eigen)	4m 38s
Build Docs	0s
	28m 41s

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