Fixes persistence of cleanup user groups after a group deletion.
Revert blobstore feature.  Functionality will be provided by usage of the ``filedepot`` package.
Remove code (incl. tests) that has been marked as deprecated since (at least) Kotti 0.8.
Remove unused imports, no longer existing console_scripts and no longer needed dependencies.
Fix imports from deprecated modules to use the right location.
Re-add missing import (don't understand why that one's needed).
Merge pull request #322 from castaf/fix_cleanup_user_groups

Fixes persistence of cleanup user groups after a group deletion.
Merge pull request #350 from disko/feature/335_remove_deprecated_code

Feature/335 remove deprecated code.  Resolves #335.
Add a changenote regarding #336.  [ci skip]
Merge remote-tracking branch 'origin/master' into feature/pcreate_scaffolds

* origin/master:
  Add a changenote regarding #336.  [ci skip]
  Re-add missing import (don't understand why that one's needed).
  Fix imports from deprecated modules to use the right location.
  Remove unused imports, no longer existing console_scripts and no longer needed dependencies.
  Remove code (incl. tests) that has been marked as deprecated since (at least) Kotti 0.8.
  Revert blobstore feature.  Functionality will be provided by usage of the ``filedepot`` package.
  Fixes persistence of cleanup user groups after a group deletion.