changed header spec to vcf 4.1, since IGV chokes on 4.2 in header
changed header spec to vcf 4.1, since IGV chokes on 4.2 in header

ernfrid/svtools,abelhj/svtools,hall-lab/svtools,abelhj/svtools,abelhj/svtools,hall-lab/svtools,hall-lab/svtools,abelhj/svtools,ernfrid/svtools