[PATCH] localrepo: better error message with obsmarkers but no evolve

[timeless]

jordi wrote:
> This error message is quite confusing.

yes, it's confusing.

> -                _('obsolete feature not enabled but %i markers found!\n')
> +                _('changeset evolution not enabled but %i '
> +                  'obsolescence markers found!\n')

Here are my iterations:
"feature 'obsolete' isn't enabled; %i markers found!\n"
"found %i markers for inactive feature 'obsolete'!\n"
"found %i markers for feature 'obsolete' -- but it isn't enabled!\n"

one of these is probably close to as good as we can get, without adding a URL.
Looking through help:

$ hg --config extensions.evolve=! help -k obsolete
Topics:
 revsets Specifying Revision Sets
Commands:
 debugobsolete       create arbitrary obsolete marker
 debugsuccessorssets show set of successors for revision
 log                 show revision history of entire repository or files

We could point to `hg debugobsolete`, since people could at least
*look* at their information that way, and perhaps decide how important
it is.