JetDiagnosticsTest migrated to TestGenerator

- test data files renamed from *.jet to *.kt

compiler/testData/diagnostics/tests/regressions/kt526UnresolvedReferenceInnerStatic.kt

@@ -0,0 +1,15 @@
+// http://youtrack.jetbrains.net/issue/KT-526
+// KT-526 Unresolved reference for inner static class
+
+package demo
+
+class Foo {
+    class object {
+        class Bar() { }
+    }
+}
+class User {
+    fun main() : Unit {
+        var <!UNUSED_VARIABLE!>boo<!> : Foo.Bar? /* <-- this reference is red */ = Foo.Bar()
+    }
+}