D25311: Add KColumnHeadersProxyModel

[Arjen Hiemstra]

ahiemstra marked an inline comment as done.

REPOSITORY
  R275 KItemModels

REVISION DETAIL
  https://phabricator.kde.org/D25311

To: ahiemstra
Cc: kossebau, vkrause, davidedmundson, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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