debugobsolete: add an option to show marker index
A bigger picture is the ability to be delete an arbitrary marker form the
repo's obsstore. This is a useful debug ability and it needs a way to indentify
the marker one wants to delete. Having a marker's index provides such an
ability.
# This config file points Mercurial at the system-wide certificate
# store from the ca-certificates package.
[web]
cacerts = /etc/ssl/certs/ca-certificates.crt