Thet refactorings

- Add a class to portlet managers, indicating how many portlets are in there.
The form is ``num-portlets-NUMBER``. This can be used to build grid layouts,
based on available css classes.

- Unify portlet manager templates to one template instead of five.

- Show links to portlet manager management views only in manage portlet view.
So, you have to visit @@manage-portlets or @@manage-content-type-portlets to
edit the ContentWellPortlets areas.

- Add contentwellportlets class to all portlet rows.

- Rename all porlet-well_manager classes to portlet-well_manager.