Patch krunner stragglers

[Jacopo De Simoi]

as per communication in irc with aseigo, here is a patch (**against
4.2 branch**) for better handling of stragglers in krunner.
Please note that the patch in libs is actually quite noisy because
there's also the backport of part of aseigo improvements for the
oldMatchesJob stuff.
the only relevant part is the "isRunning" method.
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