Plumi 3.x to 4.x migration guide
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 - Back up your Data.fs, the blobstorage and the transcoded videos directory
 - Go to the add-ons panel in the 3.x instance and uninstall Vaporisation, ATCountryWidget, json_migrator, plumi.migration
 - Go to the @@manage-portlets page of your Plumi 3.x instance and remove the tagcloud portlet
 - Copy var/filestorage var/blobstorage and the transcoded directories from the 3.x to the 4.0 buildout directory
 - Update site.cfg, bootstrap & buildout
 - Start supervisor & your debug instance
 - Migrate plone
 - Reinstall plumi
 - Update site title, description, email, analytics code

