only set end to 1 if slop is negative and rolls off start of chrom
only set end to 1 if slop is negative and rolls off start of chrom

arq5x/bedtools2,arq5x/bedtools2,arq5x/bedtools2,jmarshall/bedtools2,jmarshall/bedtools2,jmarshall/bedtools2,arq5x/bedtools2,jmarshall/bedtools2,jmarshall/bedtools2,arq5x/bedtools2