An assignment places a module's directories and its accesses (hq 153)

A definition names no host path (ADR 0112); an adopted machine keeps its
data where the predecessor put it. Two settings, validated like endpoints:

  places:   {<directory id>: <path> | {path, owner}}
  accesses: {<access id>: <path>}

An access may now be declared by id (`{"id": "series", "mode": "read-write"}`)
and named in mounts, env and content as ${access:<id>}; the assignment
says where it is on this node, and an access nobody placed is refused by
name. A definition still carrying a path keeps it as the default the
assignment replaces. A placed directory takes the assignment's owner
where it says one. Resolved in composition, so the host receives paths
and owners exactly as before.

internal/catalogue/settings.go

@@ -202,6 +202,14 @@ func UnusedSettings(m Manifest, layers []Layer) []string {
 			if key == EndpointsSetting && len(m.Listens) > 0 {
 				continue
 			}
+			// `places` puts a declared directory where this machine keeps it, `accesses` says where
+			// the operator's data is (novox/hq issue 153). Validated in Places and AccessPlaces.
+			if key == PlacesSetting && len(directoriesOf(m)) > 0 {
+				continue
+			}
+			if key == AccessesSetting && len(m.Accesses) > 0 {
+				continue
+			}
 			unused = append(unused, fmt.Sprintf(
 				"%s sets %q, and %s has no file or contribution to merge it into",
 				layer.From, key, m.Module))