build_intersect: Given a GRangesList object, determine which items overlap...
In ArnaudDroitLab/ef.utils: Eric Utilities

Given a GRangesList object, determine which items overlap each others.

1	build_intersect(grl, keep.signal = FALSE)

`grl`	The GRangesList object whose elements need to be overlapped with each others.
`keep.signal`	Should the values of signal be kept?

A list with the following elements:

Regions: A GRanges object with all genomic ranges occupied by at least one item. All ranges are "flattened", so if two of the initial ranges overlapped each other imperfectly, they are combined into a single region spanning both of them.
Matrix: A matrix, with ncol= the number of items in the initial GRangesList and nrow= the total number of loci, which is equal to the length of Regions. A value of 1 or more within the matrix indicates that the regions described by the column overlapped the region defined by the row.
List: A list of length(grl) numeric vectors indicating which indices of Regions overlap with the given condition/protein. Useful to translate the regions into unique names for drawing venn diagrams.
Names: The names of the initial grl items, corresponding to the column names of Matrix and the names of the element of List.
Length: The number of items in the initial GRangesList, corresponding to the number of columns in Matrix and the number of elements in List