Add TGI annotator version 4 as valid value.
Add Samtools version 0.1.19
Validate newly called SVs in addition to the sv_variant_list

*Delay running SV validation until after DV2 finishes
*Don't require an sv_variant_list to run validation

CHANGELOG: ValidateSVs in SomaticValidation will now validate any newly
detected SVs even if no sv_variant_list is supplied.