D16665: Add programmaticaly useful error signalling

[Aleix Pol Gonzalez]

apol added a comment.


  Maybe it would be good to produce the Discover patch before committing this to make sure the API is the one we want.

REPOSITORY
  R304 KNewStuff

REVISION DETAIL
  https://phabricator.kde.org/D16665

To: leinir, #knewstuff, apol
Cc: kde-frameworks-devel, #knewstuff, michaelh, ZrenBot, ngraham, bruns
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