GM: build requries dbsnp build w/ vcf
GM: writer factory sets in_place_of_null_value to NA
GM: get sample from first genotype; splice out code into separate methods
GM: read unannotated file uses vcf to annotate
GM: rename read tsv and annotate
GM: add write csv to handle writing entries to csv
GM: write csv has default headers
GM: writer factory reequires header, not sample name
GM: format types info is in model
GM: fully qualify data dumper print
GM: r/w test tweeking
GM: set undef/. values to NA in write csv
GM: test varition build uses vcf; upped test dir version to 3
GM: get format types from header only if exists
GM: change writer factory params
GM: test alleles and genotype stats in extract
GM: rm entry factory
GM: use sample name instead of id
GM: update extract test comapre vcfs