new /v2 subdirectory

v2/opt-manager.go

@@ -0,0 +1,10 @@
+package cli
+
+func (cli *CliParser) SetOptionValue(name string, value string) (err error) {
+	if opt := cli.findOptionByArg(name); opt != nil {
+		_, _, err = opt.parse(cli, -1, &value)
+	} else {
+		err = errOptionNotFound(name)
+	}
+	return
+}