Rename namespace class to {package.name}Package

Conflicts:

	compiler/jet.as.java.psi/src/org/jetbrains/jet/asJava/JavaElementFinder.java

compiler/testData/writeFlags/function/deprecatedFlag/extentionFun.kt

@@ -3,5 +3,5 @@ class MyClass() { }
 deprecated("") fun MyClass.test() {}
 
 // TESTED_OBJECT_KIND: function
-// TESTED_OBJECTS: namespace, test
+// TESTED_OBJECTS: _DefaultPackage, test
 // FLAGS: ACC_DEPRECATED, ACC_PUBLIC, ACC_FINAL, ACC_STATIC

compiler/testData/writeFlags/function/deprecatedFlag/topLevelFun.kt

@@ -1,5 +1,5 @@
 deprecated("") fun test() {}
 
 // TESTED_OBJECT_KIND: function
-// TESTED_OBJECTS: namespace, test
+// TESTED_OBJECTS: _DefaultPackage, test
 // FLAGS: ACC_DEPRECATED, ACC_PUBLIC, ACC_FINAL, ACC_STATIC