Convert dashboard to be a generic view

Review Request #47 — Created June 3, 2007 and submitted — Latest diff uploaded

Review Board SVN (deprecated)
We weren't using generic views in the dashboard because there's
a bug in Q objects that was preventing us from creating a query
for the "all incoming reviews" view.  We hacked around this by
doing the OR+distinct step ourselves using lists.

It turns out that with just a little coaxing, django's generic
object_list view can be used with a list instead of a QuerySet.
This change does that, and makes the dashboard into a simple
superset of object_list.  The major benefit of this is that we
get pagination basically for free.
Set pagination interval very low (for my meager number of
review requests in my test server) and tried a couple
different views in the dashboard.