align hdag format with HyperdagDB (#10) #19

Job	Run time
Build (RelWithDebInfo)	6m 1s
Build (Debug)	3m 15s
Build (Release)	4m 4s
Build (RelWithDebInfo-noEigen)	6m 16s
Build & Test (RelWithDebInfo + Eigen)	7m 2s
Build & Test (RelWithDebInfo, no Eigen)	4m 39s
Build Docs	57s
	32m 14s

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