No longer adds a binding of ID -> . when the ID field is dot in the VCF

-- Really we should make ID a primary key in VariantContext.  Putting it into the attributes is just annoying now

public/java/src/org/broadinstitute/sting/utils/codecs/vcf/AbstractVCFCodec.java

@@ -381,7 +381,8 @@ public abstract class AbstractVCFCodec implements FeatureCodec, NameAwareCodec,
             }
         }
 
-        attributes.put(VariantContext.ID_KEY, id);
+        if ( ! id.equals(VCFConstants.EMPTY_ID_FIELD) )
+            attributes.put(VariantContext.ID_KEY, id);
         return attributes;
     }