.arcconfig

addremove: pass command-level similarity value down to scmutil.addremove()

Since we've changed to carry a similarity value by opts dict, it makes sense
to leave a string '0'-'100' value unmodified.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}