bugfix to GBrowse xrefs for region specifications: only consider features that are actually reference features
bugfix to GBrowse xrefs for region specifications: only consider features that are actually reference features

solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn