Compute cartesian coordinates of a cluster center and radius

Cleans up proposed move matrix

1 | ```
clean_moves_matrix(theta, moves, n_zones)
``` |

`theta` |
original configuration |

`moves` |
proposed moves |

`n_zones` |
total number of single zones in region |

A matrix with `kstar`

rows, and each column being a proposed configuration, with
the component single zone indices being sorted (i.e. each column).

Albert Y. Kim

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