Integrated Pipeline: moved FileTree class to top-level package

integrated-pipeline/src/test/scala/eu/nomad_lab/integrated_pipeline_tests/package.scala

@@ -6,7 +6,8 @@ import akka.actor.ActorSystem
 import akka.stream.ActorMaterializer
 import eu.nomad_lab.TreeType.TreeType
 import eu.nomad_lab.h5.{ CalculationH5, FileH5 }
-import eu.nomad_lab.integrated_pipeline.messages.{ FileParsingTask, FileTree, InMemoryResult }
+import eu.nomad_lab.integrated_pipeline.FileTree
+import eu.nomad_lab.integrated_pipeline.messages.{ FileParsingTask, InMemoryResult }
 import eu.nomad_lab.meta.MetaInfoEnv
 import eu.nomad_lab.parsers._
 import org.json4s.JsonAST.{ JNothing, JObject, JString, JValue }