D18380: KIO: make file dialog columns resizable again (and movable)

[René J . V . Bertin]

rjvbb set the repository for this revision to R241 KIO.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D18380

To: rjvbb, ngraham, #frameworks, #dolphin, apol, dfaure, ahartmetz
Cc: cfeck, dhaumann, kwrite-devel, kde-frameworks-devel, michaelh, ngraham, 
bruns