Fixed barcode scanning and puzzle transfers

A few people had issues where scanning barcodes wasn't working or trades didn't auto-transfer the puzzles. These are fixed now.

It turns out that some cameras were sending extremely large images of the barcodes. This is a good thing for image quality, but the default settings of the system were causing the image to be promptly discarded during image processing. The settings were adjusted and barcode scanning appears to be working for all the phones and mobile devices we could test with.

A few puzzle trades were failing to place the traded puzzle into the collection of the receiving person. This is annoying when the person had to manually add the puzzle into threir collection. The exact cause of this seemingly random glitch has not been tracked down, but to be sure this is minimized, a nightly job is running to look for this situation and correct it.