Got rid of "namespace" term in descriptors module.

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetNamespaceHeader.java

@@ -59,7 +59,7 @@ public class JetNamespaceHeader extends JetReferenceExpression {
     @NotNull
     public Name getNameAsName() {
         PsiElement nameIdentifier = getNameIdentifier();
-        return nameIdentifier == null ? SpecialNames.ROOT_NAMESPACE : Name.identifier(nameIdentifier.getText());
+        return nameIdentifier == null ? SpecialNames.ROOT_PACKAGE : Name.identifier(nameIdentifier.getText());
     }
 
     public boolean isRoot() {

compiler/frontend/src/org/jetbrains/jet/lang/resolve/JetModuleUtil.java

@@ -25,6 +25,6 @@ import org.jetbrains.jet.lang.types.PackageType;
 public class JetModuleUtil {
     public static PackageType getRootPackageType(JetElement expression) {
         // TODO: this is a stub: at least the modules' root namespaces must be indexed here
-        return new PackageType(SpecialNames.ROOT_NAMESPACE, JetScope.EMPTY, ReceiverValue.NO_RECEIVER);
+        return new PackageType(SpecialNames.ROOT_PACKAGE, JetScope.EMPTY, ReceiverValue.NO_RECEIVER);
     }
 }