Changed visibility of getSampleDB from protected to public as the sampleDB needs to be accessible from Annotators and Evaluators too.

public/java/src/org/broadinstitute/sting/gatk/walkers/Walker.java

@@ -88,7 +88,7 @@ public abstract class Walker<MapType, ReduceType> {
         return getToolkit().getMasterSequenceDictionary();
     }
 
-    protected SampleDB getSampleDB() {
+    public SampleDB getSampleDB() {
         return getToolkit().getSampleDB();
     }