Use package maintainer groups
Use package maintainer groups

* Add to pckage maintainer group when creating a new package
* When doing a bulk import, every user who has uploaded a package
  goes into that package's maintainer group
* Uploading a new version of an existing package requires memebership
  in the package maintainer group
* Uploading documentation for a package requires membership in the
  package maintainer group


beni55/hackage2,isomorphism/hackage2,beni55/hackage2