Fix to address error when Bzone has 0 employees

This release contains a small fix in the LocateEmployment module to avoid generating NA values when a Bzone has zero employment (zeroes are substituted). Notwithstanding it being a "pre-release", this version of VisionEval should work for production models; email us at [email protected] if you run into problems.

You will need R 4.1.2 running on Windows to use the binary installer. Let us know if you need help building for another R version or operating system.