Add gff3tobed converter to igvtools
Add gff3tobed converter to igvtools

amwenger/igv,amwenger/igv,godotgildor/igv,amwenger/igv,igvteam/igv,igvteam/igv,godotgildor/igv,godotgildor/igv,itenente/igv,igvteam/igv,itenente/igv,godotgildor/igv,itenente/igv,amwenger/igv,itenente/igv,igvteam/igv,itenente/igv,amwenger/igv,godotgildor/igv,igvteam/igv