[WIP] Action feed prototype using a separate table for storing actions

Review Request #3151 — Created June 19, 2012 and discarded — Latest diff uploaded

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In the current stage, the action feed is the default dashboard view and it displays info related to [almost] any update to the requests the user has previously visited.
The action-boxes contain the review request id and summary, the name of the user who performed the action and the type of action performed.

Still to-do:
   * restyle the dashboard entries box
   * make the action boxes expandable and implement ajax calls to display their content
No tests yet - will start running them/ adding new ones once this is a bit more advanced.