Gentypegvcfs added freevar to avoid double annotation flag

protected/biopet-gatk-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/gatk/broad/GenotypeGVCFs.scala

@@ -10,7 +10,7 @@ import java.io.File
 import nl.lumc.sasc.biopet.utils.config.Configurable
 
 class GenotypeGVCFs(val root: Configurable) extends org.broadinstitute.gatk.queue.extensions.gatk.GenotypeGVCFs with GatkGeneral {
-  annotation ++= config("annotation", default = Seq("FisherStrand", "QualByDepth", "ChromosomeCounts")).asStringList
+  annotation ++= config("annotation", default = Seq(), freeVar = false).asStringList
 
   if (config.contains("dbsnp")) dbsnp = config("dbsnp")
   if (config.contains("scattercount", "genotypegvcfs")) scatterCount = config("scattercount")