D16665: Add programmaticaly useful error signalling

[Dan Leinir Turthra Jensen]

leinir added a dependent revision: D16776: Better error handling in KNewStuff backend.

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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