Maillist creation does not run the MTA-specific list creation tasks

[ioparaskev]

Checking the mailman script for the mail list creation and comparing it to the Create function the api uses, lines 236-240 are missing from the api part.
This results in possible issues with postfix. Specifically creating a new list and trying to send an email to that list results in error Recipient address rejected: User unknown in relay recipient table.