.arcconfig

phabricator: allow multiple DREVSPEC args to phabread|phabimport|phabupdate

Per Augie's request.  Like regular revsets, the result is the union of all given
specs.  Unlike regular revsets, these don't resolve in parent -> child order,
and should be specified as such on the command line.

This change invalidated a previous test using an empty `hg phabread`, so it has
been switched to `hg debugcallconduit` to preserve that coverage.

Differential Revision: https://phab.mercurial-scm.org/D8233

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