Add skip predicate to inrange

[Datseris]

Is this not possible to be done, which is why it does not exist?
If yes, sorry for the reduntant issue!

Since it is common that inrange can be used for points that also belong in the dataset that composes a tree, a skip predate could be useful. But also generally as well.

For now I use

point = dataset[n]
idxs = inrange(tree, point, ϵ)
deleteat!(idxs, findin(idxs, n))