Wildlife@Home: merging too dark/corrupt/camera issue buttons

There is now just one button for videos that have any problems (corruption, too dark, knocked over camera). I'm updating the validator (might not be done until tomorrow) -- so the validator will be off until I've gotten things working again.I'm going to have to do some re-validation of results because of this, but in general I think everyone's credit will go up a little bit; because unsure now will also partially validate against too dark/corrupt/camera problems. I hope no one has a problem with that.I've also added a column to the database for your observations that will track how much credit is awarded for each of your observations. I think this will help debug the validator even further, and will give you all a better idea of how credit (and partial credit) is being awarded, so we can get everything just right.

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