changelog-v2: add a configuration to disable rank computation...
changelog-v2: add a configuration to disable rank computation
We encountered a graph where rank computation was pathologically slow. We add an
option to disable this computation while this is getting fixed.
Disabling the rank computation should allow for testing other changelog-v2
features undisturbed (like changeset-based copy tracing).
I am purposely not adding a test for the new non-default code path, as this is
a temporary work around of an experimental feature.
