Better printing with toSimpleString() -- now prints out chip-genotype string

git-svn-id: file:///humgen/gsa-scr1/gsa-engineering/svn_contents/trunk@1288 348d0f76-0448-11de-a6fe-93d51630548a

java/src/org/broadinstitute/sting/gatk/refdata/rodGFF.java

@@ -110,7 +110,7 @@ public class rodGFF extends BasicReferenceOrderedDatum implements AllelicVariant
     }
 
     public String toSimpleString() {
-        return String.format("%s", feature);
+        return String.format("chip-genotype: %s", feature);
     }