HOW-TO-local-git-repo:  add forgotten 'git update-server-info' command

This is obviously an afterthought, and needs to be rewritten after
building the repo from scratch so that the order of steps can be
correctly explained.
multiple single branch schedulers when multiple branches in changesource

Update config.yaml.sample
HOW-TO-local-git-repo:  fix the umask problem; hack for branch access

FIXME the branch names need to be fixed.