Disable gathering

public/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/BiopetCommandLineFunction.scala

@@ -15,17 +15,17 @@
  */
 package nl.lumc.sasc.biopet.core
 
-import java.io.{ PrintWriter, File, FileInputStream }
+import java.io.{File, FileInputStream, PrintWriter}
 import java.security.MessageDigest
 
 import nl.lumc.sasc.biopet.utils.Logging
-import org.broadinstitute.gatk.utils.commandline.{ Output, Input }
+import org.broadinstitute.gatk.utils.commandline.{Gather, Input, Output}
 import org.broadinstitute.gatk.utils.runtime.ProcessSettings
 import org.ggf.drmaa.JobTemplate
 
 import scala.collection.mutable
 import scala.io.Source
-import scala.sys.process.{ Process, ProcessLogger }
+import scala.sys.process.{Process, ProcessLogger}
 import scala.collection.JavaConversions._
 
 /** Biopet command line trait to auto check executable and cluster values */
@@ -36,6 +36,7 @@ trait BiopetCommandLineFunction extends CommandLineResources { biopetFunction =>
   var deps: List[File] = Nil
 
   @Output
+  @Gather(enabled = false)
   var outputFiles: List[File] = Nil
 
   var executable: String = _