ArchivedVariantFiles inside a Variant hashed by fileId + studyId, not only by fileId
New class VariantStudy, which is described by some metadata and contains a list of VariantSource objects
Create new VariantAggregatedFactory for aggregated Vcfs. This factory loads Maf/AlleleMAf (from attributes) into stats
Reader for VCF files that doesn't transform the records into Variant objects
Merge pull request #7 from aaleman/feature/aggregatedVcfFactory

New VariantAggregatedFactory
Writer for VCF files that doesn't take Variant objects but VcfRecords as input
MNV variant type recognised, improvements on indels start and end detection
VariantAggregatedVcfFactory class overrides method parseSplitSampleData to avoid even trying to parse samples information
Using x.isEmpty() instead of x.size() == 0
Loading accession IDs considering the allele index it is currently being processed
Many new fields added to the VariantStudy class
Merging branch 'develop' into 'feature/consequence-type'
New VariantAnnotation classes connected with CellBase web services