func CompactPrintBranch(b *pfs.Branch) string {
	return fmt.Sprintf("%s@%s", b.Repo.Name, b.Name)
}
func CompactPrintBranch(b *pfs.Branch) string {
	return fmt.Sprintf("%s@%s", b.Repo.Name, b.Name)
}
// CompactPrintBranch renders 'b' as a compact string, e.g.
// "myrepo@master:/my/file"