Review Request: Add versioning check for thumbnailers.

[Jacopo De Simoi]

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http://reviewboard.kde.org/r/2282/
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Review request for kdelibs, Peter Penz, David Nolden, and David Faure.


Summary
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Adds versioning check for thumbnailers; the code checks if a ThumbnailerVersion is defined and if so, checks that the software field in the existing thumbnail matches before using the cached thumbnail. 

This fixes caching bugs with the improved jpeg thumbnailer.


Diffs
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  trunk/KDE/kdelibs/kio/kio/previewjob.cpp 1038240 

Diff: http://reviewboard.kde.org/r/2282/diff


Testing
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Thanks,

Jacopo