atacr: Analysing Capture Seq Count Data

normalise counts by window width (counts / window width)

1	normalise_by_window_width(data, which = "bait_windows", per = 1000)

`data`	a list of SummarizedExperiment objects from atacr::make_counts()
`which`	the subset of the data to normalise. Default = bait_windows
`per`	= the expression count / width gives the reads in the window divided by the width, so a 3000 nt gene with 30000 reads mapping to it will have a read count of just 10. Setting this parameter allows you to represent the counts per some other number of nts. Default = 1000, so gives the reads per kb of the gene.