fix vcfstats to work with MNPs (again)
fix vcfstats to work with MNPs (again)

alimanfoo/vcflib,ekg/vcflib,zeeev/vcflib,zeeev/vcflib,glennhickey/vcflib,vcflib/vcflib,ashishjain1988/vcflib,hyphaltip/vcflib,tomdcsmith/vcflib,wzugang/vcflib,zhmz90/vcflib,hyphaltip/vcflib,ashishjain1988/vcflib,hyphaltip/vcflib,glennhickey/vcflib,vcflib/vcflib,zhmz90/vcflib,jewmanchue/vcflib,alimanfoo/vcflib,ashishjain1988/vcflib,vcflib/vcflib,travc/vcflib,vcflib/vcflib,tomdcsmith/vcflib,alimanfoo/vcflib,vcflib/vcflib,glennhickey/vcflib,glennhickey/vcflib,vcflib/vcflib,travc/vcflib,ekg/vcflib,wzugang/vcflib,ashishjain1988/vcflib,wzugang/vcflib,jewmanchue/vcflib,alimanfoo/vcflib,tomdcsmith/vcflib,andersje/vcflib,andersje/vcflib,ekg/vcflib,andersje/vcflib,ekg/vcflib,jewmanchue/vcflib,harshinamdar/vcflib,zeeev/vcflib,harshinamdar/vcflib,harshinamdar/vcflib,jewmanchue/vcflib,ashishjain1988/vcflib,hyphaltip/vcflib,ekg/vcflib,vcflib/vcflib,alimanfoo/vcflib,zeeev/vcflib,hyphaltip/vcflib,harshinamdar/vcflib,vcflib/vcflib,zhmz90/vcflib,hyphaltip/vcflib,zhmz90/vcflib,andersje/vcflib,jewmanchue/vcflib,jewmanchue/vcflib,glennhickey/vcflib,zeeev/vcflib,andersje/vcflib,harshinamdar/vcflib,harshinamdar/vcflib,ashishjain1988/vcflib,glennhickey/vcflib,alimanfoo/vcflib,travc/vcflib,zeeev/vcflib,wzugang/vcflib,wzugang/vcflib,zhmz90/vcflib,zhmz90/vcflib,wzugang/vcflib,andersje/vcflib