[galaxy-commits] galaxy-dist commit f71716f286ee: Add GFF support to GOPS subtract tool and updated functional tests. Using the GFF-->BED converter is lossy as GFF has more attributes/features than BED, so it's necessary to directly support GFF. Basic approach used is to modify interval coordinates during reading and writing while not changing the middle, computational steps; this approach can be used to provide GFF support for any tool that uses bx-python to operate on intervals.