[Merge] lp:~flo-fuchs/postorius/archival_options into lp:postorius

[Florian Fuchs]

OK, if the built-in archivers are not enabled in mailman.cfg, mailman will save the activation status for the current list internally, but they will still show up as disabled, because the archivers are not enabled globally. As soon as this is done, they will show up as enabled on the list-level tool. 

What we need is a message explaining this if a global *not* enabled archiver is enabled through the UI. 
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https://code.launchpad.net/~flo-fuchs/postorius/archival_options/+merge/256167
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