Citizen Science Grid: [wildlife] credit inconsistencies

I've updated the algorithm which calculates credit in order to deal with credit inconsistencies we've been seeing recently. If you're still seeing wildly varying credit for workunits that take the same amount of time on your machines please let me know. Note that there are some 200-300 workunits in the queue that were still generated with the old credit algorithm so it may take a little time for the new workunits to start flowing out. Hope this fixes things!

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