Stan-Dev/Cmdstan V2.17.0

v2.17.0 CmdStan release notes Most of the changes are due to improvements in the Stan and Math libraries. See the release notes for Stan v2.16.0 and Math v2.16.0 for more details. Download instructions Note: Download using the links to cmdstan-2.16.0.tar.gz or cmdstan-2.16.0.zip for a version that includes Stan and all libraries. (The "Source code" downloads does not include the Stan library and will not work as-is.) To clone CmdStan using git, see: https://github.com/stan-dev/cmdstan/wiki/Getting-Started-with-CmdStan