Output of multi sample VCF to multisample TSV table

[wyleung]

In the current implementation, the output TSV is a multitsv table generated during the merge.

Ideally, this report-transformation process is seperated from the merging step and should take the output-vcf to report the events in Excel like format.

By seperating these concerns, one can write a script that converts the merged.vcf to a table with additional annotations (f.e.g. copy number analysis, or mappability track confidence intervals)