“Space-dye Vest” third bugfix release

Improvements

• follows symlinks
• improved documentation and added key generation example (thanks! Anna)

Bugfix

• fix syslog logging on FreeBSD. Reported by Karl Jeacle, thanks!
• don't crash if -c is missing in configtest mode (-n). Reported by heph, thanks!
• allow fstat64 on linux (needed by glibc on aarch64). Reported by pine, thanks!