Fix ValueError when doing migrations.

See http://askbot.org/en/question/11851/valueerror-the-database-backend-does-not-accept-0-as-a-value-for-autofield/ for details.
Remove askbot's createsuperuser.

http://askbot.org/en/question/11806/nameerror-global-name-user-is-not-defined-fresh-install-askbot-only/
Add key to group map table

Avoids problem with missing .id field when importing.
Set nordic-email for anonymous accounts

Doesn't really matter, but still.
Don't set parent id to 0 for questions
Set edited-by to post author instead of 0