drawCorner: drawCorner
In cognopod/corners: Simulating and Visualizing Sets

drawCorner is a function that is used by fourCorners to draw one of the leaves.

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drawCorner(sector, nElements, drawTop, drawRight, leafColor,
  offset = 0.028, rElement = 0.02, unique = FALSE,
  shape = "square")

`sector`	is a predefined viewport
`nElements`	is the number of elements to plot
`drawTop`	is half of the definition of the corner of the viewport to draw the elements in (1 = top)
`drawRight`	is the other half of the definition of the corner (1 = right)
`leafColor`	is the color for that particular leaf
`rElement`	is the size of the element
`unique`	draws with white fill so that a fifth call can draw unique elements
`shape`	draws shape (either "circle" or "square")
`offSet`	is the distance between elements