config group groupwanted numcopies schedule wanted required: Avoid
displaying extraneous messages about repository auto-init, git-annex branch
merging, etc, when being used to get information.
Any config names can be set using this; git-annex commands will only look
at specific ones that make sense and are worth the overhead of querying the
branch.
This might also be useful for storing whatever other config-type stuff the
user might want to shove into the git-annex branch.
This commit was sponsored by Jochen Bartl on Patreon.