vcf2maf v1.3

• Added a maf2vcf helper script
• Support added for many new variant effects
• Several new test VCFs in various simple/complex formats
• Support for extracting ALT/REF depths from various simple/complex VCF formats
• Simple cutoff-based genotype prediction based on ALT/REF depths, if GT is undefined in VCF
• Avoid re-annotation if a .vep.vcf or .snpeff.vcf was generated in a previous run
• Create an output MAF with only a header, when given VCFs with zero variants