Features:
+* move documentation about our common env vars (SYSTEMD_LOG_LEVEL,
+ SYSTEMD_PAGER, …) into a man page of its own, and just link it from our
+ various man pages that so far embedd the whole list again and again, in an
+ attempt to reduce clutter and noise a bid.
+
* vmspawn switch default swtpm PCR bank to SHA384-only (away from SHA256), at
least on 64bit archs, simply because SHA384 is typically double the hashing
speed than SHA256 on 64bit archs (since based on 64bit words unlike SHA256