This is recommended by the Django documentation

Update to beta 1

This commit makes the activemembers admin a lot faster by doing the
following two things:

1. Add `member` to `raw_id_fields` in the inline for committee
   memberships. Before the entire list of members was copied for every
   committee membership. This resulted in html pages of several
   megabytes.
2. Remove duplicate queries (for different ids) by adding
   `select_related` calls in the right places.

This completes the XOR check; either a verbatim address or a list

Changes the URL to match the new "front page" for boards. The current_board view is now unused and has thus been removed.