view .arcconfig @ 44309:6c07480d6659

nodemap: add a function to read the data from disk

This changeset is small and mostly an excuse to introduce an API function
reading the data from disk.

Differential Revision: https://phab.mercurial-scm.org/D7836

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    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
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