x=NULL all repositories listed in
options(nat.templatebrains.regdirs) are checked to see if they are git
repositories and, if yes, they are pulled to update.
update_reg_repos(x = NULL)
Path to local checkout of a registration git repository. See details for meaning of default.
This function is principally called for its side effect, but does
git2r::repository object containing the path on disk to the
location of the git repository with registration.