read.bedix: Retrieve a subset of an indexed BED file
In guigolab/sQTLseekeR2: R package for splicing QTL mapping

Using Rsamtools functions to manipulate tabix file, the indexed BED file is read and the features present in the selected region are retrieved.

1	read.bedix(file, subset.reg = NULL, header = TRUE)

`file`	a BED file containing the data to be read. It should be compressed with `bgzip` and indexed by tabix algorithm.
`subset.reg`	a data.frame or GRanges object with the regions to subset from. If a data.frame, it must have columns named 'chr', 'start' and 'end'.
`header`	should the first line of `file` be used as header. Default is `TRUE`.