This is a very fast version of cir with allowOverlap = TRUE, allowDuplicates = FALSE,
returnIndices = TRUE, returnDistancse = TRUE, and includeBehaviour = "excludePixels".
It is used inside spread2, when asymmetry is active. The basic algorithm is to run cir
just once, then add to the xy coordinates of every locus

.cirSpecialQuick(landscape, loci, maxRadius, minRadius)

## Arguments

- landscape
Raster on which the circles are built.

- loci
Numeric. An alternative to `coords`

. These are the indices on
`landscape`

to initiate this function. See `coords`

. Default is one
point in centre of `landscape`

..

- maxRadius
Numeric vector of length 1 or same length as coords

- minRadius
Numeric vector of length 1 or same length as `coords`

. Default is
`maxRadius`

, meaning return all cells that are touched
by the narrow ring at that exact radius. If smaller than `maxRadius`

,
then this will create a buffer or donut or ring.