Change stats to histogram

public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/extensions/picard/CollectGcBiasMetrics.scala

@@ -71,7 +71,7 @@ class CollectGcBiasMetrics(val root: Configurable) extends Picard with Summariza
   def summaryFiles: Map[String, File] = Map()
 
   /** Returns stats for summary */
-  def summaryStats = Picard.getMetrics(output).getOrElse(Map())
+  def summaryStats = Picard.getHistogram(output, tag = "METRICS CLASS")
 }
 
 object CollectGcBiasMetrics {

public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/extensions/picard/CollectMultipleMetrics.scala

@@ -81,7 +81,7 @@ class CollectMultipleMetrics(val root: Configurable) extends Picard with Summari
         case _ if p == Programs.MeanQualityByCycle.toString =>
           Picard.getHistogram(new File(outputName + ".quality_by_cycle_metrics"))
         case _ if p == Programs.CollectBaseDistributionByCycle.toString =>
-          Picard.getMetrics(new File(outputName + ".base_distribution_by_cycle_metrics"))
+          Picard.getHistogram(new File(outputName + ".base_distribution_by_cycle_metrics"), tag = "METRICS CLASS")
         case _ => None
       }
       val sum = new Summarizable {