Three-year-old Cambridge startup Humatics Corp. is acquiring San Diego-based 5D Robotics Inc. in hopes of eventually expanding its "microlocation technologies" to the world of smart cities and autonomous vehicles. Humatics, co-founded by MIT engineering David Mindell, has so far been using its sensor technology to improve the way humans and robots interact on the factory floor. The company raised $18 million last year from Fontinalis Partners, a Detroit and Boston-based venture firm focused on...