[svn r125] Renamed/moved a few backend member inside DMD structures for consistency.

Unit tests are now implemented.

test/bug77.d

@@ -12,6 +12,8 @@ void main()
         len = strlen(prefix);
         assert(len == 0);
         }
+
+        func();
     }
     func2();
 }

test/unittest1.d

@@ -1,9 +1,10 @@
 module unittest1;
 
-unittest
-{
-}
-
 void main()
 {
 }
+
+unittest
+{
+    printf("hello\n");
+}