[User Story] Keep both FOUND_IN variantcaller tags in merged variants

[mathiasbio]

Need

As a clinician I would like to see from which callers a variant has been called. Currently in release 16.0.0 of balsamic, when a variant is called by both TNscope and VarDict, only VarDict information remains. This is not correct, and leads to view of TNscope as primarily calling questionable / artefact variants as only those uniquely called by TNscope are labled as called by TNscope.

We need to update the merging method so at a minimum the information about which caller found the variant is retained.

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System requirements assessed

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