Merge branch 'pb/gitweb'

* pb/gitweb:
  gitweb: Support for simple project search form
  gitweb: Make the by_tag filter delve in forks as well
  gitweb: Support for tag clouds
  gitweb: Add support for extending the action bar with custom links
  gitweb: Sort the list of forks on the summary page by age
  gitweb: Clean-up sorting of project list