Fix the datetime parsing to handle optional fractions of seconds

fix #3266

Better document the identd server

Do not call pkg_check_module if the MODULE_FOUND is already cached

Remove a few warnings occuring in some build config

The RPM doesn’t contain biboumi.cfg anymore

Do not install biboumi.cfg in /etc/biboumi/

Because it would overwrite the user file when installing a new version.  And
it’s basically useless anyway, because if the file doesn’t exist at all,
biboumi will write an helpful message on stderr, telling the user to create
the config file.

Handle messages 367 and 368 to display the banlist in the MUC

fix #3234

Refactor the channel::self to point at the existing user

This way, the user is always up to date, instead of being a duplicate out of
sync.

fix #3258

Redirect welcome NOTICE to their channel, instead of sending a global one

fix #3236

Update changelog

Test the default channel list limit

fix #3219

Make the default build type Release (instead of empty string)

Make the IRC channel configuration form available from the MUC config

fix #3250

Remove the “codecov_” prefix for builds codecov uploads too

Fix the build when litesql is not used

Improve the handling of the biboudb.hpp dependencies

Small fixes in biboumi.1.rst

Avoid any potential int overflow

Also make the test artifacts expire in 2 weeks

Remove a useless debug log