Kotlin I/O new features: relativeTo, copyTo, copyRecursively, deleteRecursively, file tree walkers,

file component iterators, file roots, startsWith, endsWith, subPath, normalize, replaceBytes, replaceTest,
additional tests and comments

Original commit: f560677b15

jps/jps-plugin/test/org/jetbrains/kotlin/jps/build/AbstractIncrementalJpsTest.kt

@@ -374,6 +374,7 @@ public abstract class AbstractIncrementalJpsTest : JpsBuildTestCase() {
             val file = File(workDir, path)
 
             val oldLastModified = file.lastModified()
+            file.delete()
             dataFile.copyTo(file)
 
             val newLastModified = file.lastModified()