If you are updating on a machine please follow these steps
*BEFORE* updating your code to this commit.

If you are installing on a fresh database and do not need to think
about existing data, ignore the following and proceed as usual.

1. Run the following migrations:
```
python manage.py migrate --fake scipost zero
python manage.py migrate --fake notifications zero
python manage.py migrate --fake partners zero
python manage.py migrate --fake affiliations zero
python manage.py migrate --fake commentaries zero
python manage.py migrate --fake comments zero
python manage.py migrate --fake finances zero
```

2. *** NOW UPDATE/PULL GIT ***
3. Run: `python manage.py migrate --fake-initial`

The mailing lists member sync was too elementary to
be used on production properly. This was for example
due to the single calls to MailChimp for each seperate
Contributor.

Now during sync, only updates are called to MailChimp, not
*all* contributors. Also, the batch operation is used instead
of seperate calls. Further, some query tweaks were used that
expect database calls to improve significant.