We can go from an end step to its previous step #361
Merged
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This updates the ODGI API so that we can actually ask a previous step for an end step. An end step is a step past the last step of a path! This is important to have so we can ask the nucleotide position of such an end step from the step index.
It also mimics the XG API in
smoothxg
. This update is a major step for implementing pangenome/smoothxg#151.