* mention cloudflare-specific nginx config
versus.md:
* seafile has a size limit on zip downloads
* seafile and nextcloud are slow at uploading many small files
u2c: improve error message in funky environments
* mostly deprecate --http-only and --https-only since there is zero
performance gain in recent python versions, however could still be
useful for avoiding limitations in alternative python interpreters
(and forcing http/https with mdns/ssdp/qr)
* mention antivirus being useless as usual