Links and filters for project and author in activity and search pages
The following patch adds links to Project and Author in Activity page, as well as filters for filtering Activity entries (it keeps all the current params passed except the project's or the author's name). Also, on the Search page it adds the same, but only for Project, since the Author field is missing (I may add in a updated patch).
Even though it's a minor change, I believe that Activity and Search pages are much more consistent and user-friendly now. See the attached screens for a better view of what this patch is all about.