~sircmpwn/deacme unlisted

Add better logging in dnsproc write* fail
Add comms[com] to readbuf malloc failure
Improve verbosity of malloc failures
Log errno in vwarn
Improve verbosity of unknown op errors
Fix vasprintf implementation
Fix setuid/setgid code
Verify SSL connections with curl
Remove meson_options.txt, update README.md
Clarify changes from acme-client
Update & install man page
Fix typo in readme
Update README.md
Remove usage of BSD's err.h
Replce config.h with util-portable.h
Clean up awful code style

This guy must get off on parenthesis or something
Style: sort includes
Switch to meson for builds
Are we portable enough yet
Remove dependency on libbsd