Comment 1 for bug 433201

It turns out that character 0x93 is a "left smart-quote". We should probably treat smartquotes as if they were regular quotation marks, but also, more generally, we should not die on characters that are outside the basic ASCII set.

This requires only a small change to backend.py. However, I won't be able to do a Windows build of a revised backend until Monday.

Annoying workaround for now: remove smart-quotes from the files you input.