Generate sub CRF by selecting some nodes

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`crf` |
The CRF generated by |

`subset` |
The vector of selected node ids |

The function will generate a new CRF from a given CRF
by selecting some nodes. The vector `subset`

contains the
node ids selected to generate the new CRF. Unlike
`clamp.crf`

, the potentials of remainning nodes and edges are
untouched.

The function will return a new CRF with additional components:

`original` |
The original CRF data. |

`node.id` |
The vector of the original node ids for nodes in the new CRF. |

`node.map` |
The vector of the new node ids for nodes in the original CRF. |

`edge.id` |
The vector of the original edge ids for edges in the new CRF. |

`edge.map` |
The vector of the new edge ids for edges in the original CRF. |

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