adjust node/edge IDs -1
adjust node/edge IDs -1

This starts node and edge IDs in the GraphML output from zero, adjusting
the KAM node/edge IDs since they index from 1.

OpenBEL/openbel-contributions,nbargnesi/openbel-contributions,nbargnesi/openbel-contributions,OpenBEL/openbel-contributions,OpenBEL/openbel-contributions,nbargnesi/openbel-contributions,OpenBEL/openbel-contributions,nbargnesi/openbel-contributions