Correct data migrations

These data migrations have been run now, but I'm correcting them here to be safe
in case folk use them as a reference in future.
Add CSV permission for all departmental editors

Allow all departmental editors to export the document list as a CSV.
Merge pull request #1863 from alphagov/correct-data-migration

Correct data migrations
Add an admin API for reindexing sector editions.

In order to get tag information for published
editions into Rummager (and thence to the services
and information page, among others) when a draft
specialist sector is published, we need to notify
Whitehall so it can resubmit all published editions
tagged with that specialist sector.
Merge pull request #1865 from alphagov/add-topic-reindex-endpoint

Add an admin API for reindexing sector editions.

https://www.pivotaltracker.com/story/show/83216078
Merge pull request #1864 from alphagov/extend-export-csv-permission

Add CSV permission for all departmental editors