* Use systemd socket activation
* Pass a new command line argument --systemd-socket-activation to the daemons if running on Linux
* Install .socket files
* Systemd services depend on their sockets
* Implement sd_listen_fds in OCaml
* Set FD_CLOEXEC in sd_listen_fds
* README: add comment about socket paths
* Linux systemd scripts: Rename albatross_stat -> albatross_stats
* Update README: Names of binaries have changed, CLI interface as well,
add instructions for installing tenders...
* Install an empty log
* Add assertion in albatross_log.service that the log file exists