Improve support for loading FeatureSources to/from sessions
Improve support for loading FeatureSources to/from sessions

Somewhat hacky, but this solution should properly save and restore any FeatureSource which properly implements JAXB

godotgildor/igv,igvteam/igv,amwenger/igv,amwenger/igv,itenente/igv,igvteam/igv,itenente/igv,itenente/igv,itenente/igv,amwenger/igv,igvteam/igv,godotgildor/igv,godotgildor/igv,godotgildor/igv,itenente/igv,amwenger/igv,igvteam/igv,igvteam/igv,amwenger/igv,godotgildor/igv