Fixes #447.   Mismatches not shown by default
Fixes #447.   Mismatches not shown by default

igvteam/igv,igvteam/igv,igvteam/igv,amwenger/igv,amwenger/igv,amwenger/igv,amwenger/igv,igvteam/igv,igvteam/igv,amwenger/igv