Fully functional std::complex specializations and overloads

[mitzimorris]

problems described here - best guess - old crap from macports - any of y’all please advise -

Upgrade to Catalina incurred problems building math lib dynamic archives (sundials)

Bob ran into problems compiling stan_math on his new MacBook pro - which he blogged about here: https://statmodeling.stat.columbia.edu/2019/12/11/macbook-pro-16-inch-2019-quick-review/ Ease of upgrade Apple makes it super easy to move everything from an old machine. Once I entered enough passwords on my menagerie of Apple devices, it took less than 2 hours to transfer everything from the old machine to the new one via my home wireless network. The only software I’ve had to upgrade to get ba…