Fix on help info for sample arg

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

@@ -26,7 +26,7 @@ import org.broadinstitute.gatk.utils.commandline.{ Argument }
 trait MultiSampleQScript extends SummaryQScript {
   qscript =>
 
-  @Argument(doc = "Only Sample", shortName = "sample", required = false)
+  @Argument(doc = "Only Sample", shortName = "s", required = false, fullName = "sample")
   private val onlySamples: List[String] = Nil
 
   require(globalConfig.map.contains("samples"), "No Samples found in config")