More checks added in Variant constructor and setters
Variant type (SNV, indel or SV) and HGVS genomic ID added as Variant attributes
VariantFactory properly parses empty snpId, and EffectCalculator patched to work with empty Variant.alternate
Variant HGVS information converted to Map
When a VCF record generates only one Variant object, manage its samples and statistics properly