The actions framework is in the process of being rewritten to give us

better consistency across all the different types of actions, a real

registry, and new features and capabilities.
This change introduces the actions app with the action base classes and

registry, along with a JavaScript-side stub model/view, template tags

for rendering the actions on pages, and the beginnings of some unit

tests.

Ran unit tests.
Used this with other changes that start porting existing actions over

  to the new framework.