Calculate maximum likelihood based measures of dispersion of...

Given the coordinates of a convex hull (i.e. a polygon), this function
calculates its area. Not intended for direct use outside of
`siberConvexhull`

.

1 | ```
hullArea(x, y)
``` |

`x` |
a vector of x-axis data |

`y` |
a vector of y-axis data |

a scalar representing the area of the convex hull in units of
`x * y`

; i.e. most commonly in permille squared for isotope data.

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