User-specified alternate answer separator #85
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An issue with the blanks content type is that the answer separator is required to be forward slash (/). This requirement means that answers that need forward slashes (like fractions, for mathematics instruction) are not possible. Through a few very minor changes in the codebase, I propose a version that leaves the forward slash in place as a default but allows users to specify an alternate answer separator. This is a non-breaking change. An alternative would be some kind of escape character, but that is not implemented here. I propose this as a conservative but very helpful improvement.