AO tag

[t-whalley]

VCF needs AO field (like in FreeBayes) if we want to use new tbtamr. Doesn't work with our outputs nor those from tb-profiler with BCFtools

[t-whalley]

These doesn't seem to be an individual sample issue. Failing

[t-whalley]

Put AF instead of calculating? bcftools +fill-tags <in> -Ob -o <out> -- -t AF