Features:
+* add form factor to /etc/machine-info
+
* use C11 static_assert() where we currently use assert_cc()
* journald: also get thread ID from client, plus thread name
* readahead: use BTRFS_IOC_DEFRAG_RANGE instead of BTRFS_IOC_DEFRAG ioctl, with START_IO
-* readahead: check whether a btrfs volume includes ssd by checking mount flag "ssd"
-
* support sd_notify() style notification when reload begins (RELOADING=1), reload is finished (READY=1), and add ReloadSignal= then to use in combination
* support sd_notify() style notification when shutting down, to make auto-exit bus services work (STOPPING=1)