Some fundamental tools

## Objective
Add some fundamental pipe for manipulating node_list.

## Detail

We can add node of run to node_list with following command.

```sh
dpmanip -s add_run /path/to/run
```

We can add key and value to configure of run node with following command.

```sh
dpmanip -s add_conf /path/to/run key value
```

We can remove tag from node of path.

```sh
dpmanip -s untag /path/to/run tagname_or_project_path
```

Currently, untag does not remove the project node,
because the null project node is not defined yet.

Why do you create new node instance?