Show tasks on my work page

The `refresh_all` function is fully functional, but still needs some work (the inner function needs to be moved and refactored a bit - I'll do this Monday morning).
This is supposed to override the previous workflow widget descriptor, right?  Detecting Dashboard and Profile pages in `init_widgets` and dispatching to a separate function (`init_widgets_for_person_page`?) would be better than silently overriding.