Only activate systemd’s watchdog if we are compiling with systemd

ref #3152

Quiet a warning

Compile with smp_mflags for tests as well

Display an info message on make dist

Install the unit file in lib/, not etc/

Include catch.hpp in the dist tarball

If catch.hpp is found in tests/, use it without cloning the git repo

Use make check in the spec file

Remove the second '-' from the package when ~dev is there

Build the doc with the default make target

Generate systemd file from template and make installs it and the conf

The unit file Type=, as well as the executable path should now be correct
with a simple “make install”, whatever the install prefix and the DESTDIR
values are.

ref #3152

Do not fail to build when litesql is not used

fix #3151

Document the Configure ad-hoc commands

Support a trusted SHA1 fingerprint to be configured for each IRC server

Support multi-prefix

See http://ircv3.net/specs/extensions/multi-prefix-3.1.html
ref #3103

This is no longer true, with the recent xmpp_server_ip configuration option

Use the configured encoding value when decoding received messages

Defaults the encoding in the DB to latin-1

Also provide in and out encoding configure options for IRC servers

Add an ad-hoc configure command on IRC channels

Include encodingIn and encodingOut options, unused at the moment