This is the same form that admin page uses when creating users.
RegistrationForm is not affected by change in forms.py in commit:
9be07d3
and thereby did not get a sorted section list from previous change.
I do not see the diffrence in accont creation between the two forms.

Changed so that section sorting occurs on all ModelForm's.
This allows us to yet again use a custom ModelForm for admin page
and another for the registration page.