Provides methods for VCF/BCF variant querying.Returns the complete list of variant files.Queries a region of a variant file.fileIDintsequenceStringstartintendintfilterIntegerfiltersListReturns a list of sequences in a variant file.fileIDintReturns a list of variant files for a particular organism.organismStringReturns a list of variant files for a particular sequence.sequenceStringlists the resources