anle...@gmail.com solution for captcha in wizard form

This is acceptable working solution imho because you are using this captcha validation only within field lifetime which is no longer than a form lifetime, so captcha can't be used by more than once, it will be deleted right after form is gone. 

I don't know the original patch author email or name, found link to solution in a first comment of issue: https://github.com/mbi/django-simple-captcha/issues/6