//usage: "[-g GID] " IF_FEATURE_ADDUSER_TO_GROUP("[USER] ") "GROUP"
//usage:#define addgroup_full_usage "\n\n"
//usage: "Add a group " IF_FEATURE_ADDUSER_TO_GROUP("or add a user to a group") "\n"
-//usage: "\nOptions:"
//usage: "\n -g GID Group id"
//usage: "\n -S Create a system group"