Add VCF headers for fields in Variant and VariantAnnotation records

[heuermh]

No description provided.

[AmplabJenkins]

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Test PASSed.

[fnothaft]

Are we going to add the FORMAT keys as well, is that going to be a later PR, or are the htsjdk ones OK there?

[heuermh]

Standard FORMAT keys will come later, once we nail down the Genotype and GenotypeAnnotation schema. Although, if you want to whack the useless ones that are there currently . . . :)

[fnothaft]

Standard FORMAT keys will come later, once we nail down the Genotype and GenotypeAnnotation schema. Although, if you want to whack the useless ones that are there currently . . . :)

I'll pick these up. PR coming shortly.