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.

Now we're using `setUpTestData` more, not running some slow code,
using MD5 hashes for speed, and using bulk_create.

Also removes some dead code.

Also changes menu link to /boards/ as it now shows all boards.

Also changes menu link to /boards/ as it now shows all boards.

This also fixes the is_staff constraint, as memberships
that ended today should not give staff access anymore. This is
a particularly important case, as this is typically what happens
when memberships end 'today' and the object is saved.

This breaks Django2 otherwise