D20348: Remove support for Collection references

[Volker Krause]

vkrause accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R199 Akonadi Console

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20348

To: dvratil, vkrause, dfaure
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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