Added a default vmem

bam-metrics/src/main/scala/nl/lumc/sasc/biopet/pipelines/bammetrics/scripts/CoverageStats.scala

@@ -16,6 +16,8 @@ class CoverageStats(val root: Configurable) extends PythonCommandLineFunction {
 
   @Output(doc = "plot File (png)")
   var plot: File = _
+  
+  override val defaultVmem = "12G"
 
   def cmdLine = getPythonCommand +
     required(input) + required("--plot", plot) + " > " + required(output)