broadinstitute / hellbender / 685

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Expose Feature headers, and provide convenient VCFHeader access in VariantWalker

-Within a tool, Feature headers can now be obtained from a FeatureContext within apply(),
 or from the inherited method getHeaderForFeatures() outside of apply() (eg., in onTraversalStart()).

-VariantWalkers have the additional inherited convenience method getHeaderForVariants()
 that returns the header for the driving source of variants typed as a VCFHeader.

-Engine-facing classes FeatureManager and FeatureDataSource now also expose headers.

Requested by Adam

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