-- They now throw an error, as its really unsafe to write out ./. as a special case in the VCFWriter as occurred previously.
-- Added convenience method in VariantContextUtils.addMissingSamples(vc, allSamples) that returns a complete VC where samples are given ./. Genotype objects
-- This allows us to properly pass tests of creating / writing / reading VCFs and BCFs, which previously differed because the VC from the VCF would actually be different from its original VC
-- Updated UG, UGEngine, GenotypeAndValidateWalker, CombineVariants, and VariantsToVCF to manage the master list of samples they are writing out and addMissingSamples via the VCU function
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