This reduces the size of the final binary by 12% by not including
symbols, and thus function bodies that have been inlined for example.

fix #3293

This makes sure that multi-lines messages are properly parsed as a single
message by journald.

fix #3268

fix #3284

[skip-ci]

Supports the "seconds", "maxstanzas", "since" and "maxchars" (but only =0)
attributes.

fix #3270

Instead of irc.example.com@biboumi, because that’s actually user named
“irc.example.com”, in that case.
And that fixes the raw messages in fixed mode.

fix #3286

This immensely speeds up the archive select queries.

fix #3292

fix #3291

fix #3290

fix #3290

Otherwise, these fields cannot be emptied by the user

fix #3281

fix #3285

fix #3224

fix #3274

fix #3277