D16618: add explicit to constructors

Fri Nov 2 22:46:15 GMT 2018

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

REPOSITORY
  R286 KFileMetaData

BRANCH
  explicit

REVISION DETAIL
  https://phabricator.kde.org/D16618

To: astippich, #frameworks, bruns, mgallien
Cc: mgallien, kde-frameworks-devel, #baloo, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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