Added Ln wrapper

biopet-framework/src/main/java/nl/lumc/sasc/biopet/wrappers/Ln.scala

+package nl.lumc.sasc.biopet.wrappers
+
+import nl.lumc.sasc.biopet.core._
+import org.broadinstitute.sting.queue.function.CommandLineFunction
+//import org.broadinstitute.sting.queue.function.QFunction
+import org.broadinstitute.sting.commandline._
+import java.io.File
+
+class Ln(val globalConfig: Config) extends CommandLineFunction {
+  def this() = this(new Config(Map()))
+  this.analysisName = "ln"
+  val config: Config = globalConfig.getAsConfig(this.analysisName)
+  logger.debug("Config for " + this.analysisName + ": " + config)
+  
+  @Input(doc="Input file") var in: File = _
+  @Output(doc="Link destination") var out: File = _
+
+  def commandLine = "ln -sf %s %s".format(in, out)
+}
+
+object Ln {
+  def addLn(input:File, output:File) : Ln = {
+    return new Ln { this.in = input; this.out = output }
+  }
+}
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