mercurial/templates/raw/graphedge.tmpl

nodemap: code to parse the persistent binary nodemap data

We now have code to read back what we persisted. This will be put to use in
later changesets.

Differential Revision: https://phab.mercurial-scm.org/D7844

edge:        ({col}, {row}) -> ({nextcol}, {nextrow}) (color {color})