Comment 1 for bug 1627373

Untested working branch available here: http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/csharp/lp1627373_edi_availability_codes

I decided to limit this to codes that we need for libraries that use Brodart, who provided me a list of codes and how they treat them on their end. My implementation does not add any cancel_reasons, but uses either "Delayed: Backordered" or "Canceled: By Vendor", depending on how Brodart handles them. I'm very interested in further use cases for this, but since this is the first bug report I've seen on this issue, I'm guessing we're the first to run into the problem.