Morphologicals: Relative area fraction of diluted pattern

Dilate pattern with b(o,r) and compute the Euler number.

1 | ```
morphoEuler(x, r, ...)
``` |

`x` |
Point pattern |

`r` |
Vector of distances to estimate the function |

`...` |
Ignored. |

Only for 2D.

Reduced sample border correction.

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