vcf2maf v1.6.5

• Update instructions and defaults to use VEP v83
• New vcf2vcf tool to create minimalist VCFs compliant with v4.2 specs
• vcf2vcf can apply some basic allele-depth based filters to VCFs, added to existing FILTER data
• Fix bug where a proper VCF AD field was overridden by depths in BCOUNT/TIR/RD/etc.
• All possible issues with POS for complex indels should now be properly handled
• Minor bug fixes, and handling new SO terms and other exceptions
• Add --cache-version option to allow use of user-specified annotation cache