complete merge of link annotations

- Use the 'store' request property for getting annotations from the
  store without knowing exactly how. This will make it possible to
  run h but delegate to another store eventually.
- Use an AnnotationFactory and Annotation resource in the traversal
  tree to decouple the views and the model.
- Fix merge weirdnesses and divergences.

h/css/displayer.css

@@ -546,7 +546,6 @@ span.errorMsg {
   height: 0.8em;
   width: 0.8em;
   position: absolute;
-  top: .4em;
   left: -0.4em;
   outline: 1px dotted #aaa;
   background-image: url("../images/minus_1.png");