Description

This PR prepends normalized suffixes to first names during blocking. Following the convention of the existing feature_iter entry for First Name, only the first suffix is pulled, and only if it has been normalized as a result of parsing. The least invasive way I found to make this change was an optional boolean flag on feature_iter proper, since otherwise in the blocking keys call we can't call feature_iter on First Name and have to basically repeat / reconstruct that code, but if that's preferable that's also okay with me.

Related Issues

Closes #298

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