Also include mailinglist aliasses in API output

Ghost Userrequested to merge
363-mailing-list-aliases-do-not-work into master

Closes #363 (closed)

Previously, aliasses were ignored. Now they appear in API output as pk_aliasname in the lists overview. When calling the API as list=pk_aliasname, the list with id pk is returned and its name is replaced with aliasname if this is a valid alias for this list.

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