Master hotfix 1.6.1 (#234)

* update

* removed submodules from master

* emergency release of version 1.6.1, with all submodules flattened. It should compile on all platforms.

* removed macos from git actions. If you want macos, you will need to install openssl through macports. We have support for the native mac crypto libraries in the next version.

* removed the darwin stuff that was causing linux configure.ac to crash

* just ubuntu 20.04 now

* install more of boost

* more typos

Author: simsong