Support for accessing arrays in the debugger

tests/debugger/print_local_structure_test.dart

 // Copyright (c) 2015, the Dartino project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
-// DartinoDebuggerCommands=b breakHere,r,f 1,p *a,p *i,p notExisting,p a.shadowMe,p a.notExisting,p a.s,p *a.s, p a.s.shadowMe,p a.s.shadowMe.a,c
+// DartinoDebuggerCommands=b breakHere,r,f 1,p *a,p *i,p notExisting,p a.shadowMe,p a.notExisting,p a.s,p *a.s, p a.s.shadowMe,p a.s.shadowMe.a,p *list._list,p *list._list.1,p *list._list.k,p *list._list.-1,p *list._list.4,c
 
 class S0 {
   var str = 'spaß';
 }
 
 class S1 extends S0 {
   var i = 42;
   var i2 = 1 << 33;
 }
 
@@ skipping 11 matching lines @@
   var t = true;
   var f = false;
   var s = new S3();
 }
 
 breakHere() { }
 
 main() {
   var a = new A();
   var i = 42;
+  var list = new List(3);
+  list[1] = a;
   breakHere();
 }