With this moncheck itself is also changed to use slog.
The early config parsing is still using log as we do not have any idea
what else to use.
But from then slog is used at all points.
With the additional config options a man page was also added to explain
the new config options.
The default worker count was set to 25, which might be too much
depending on the amount of cores available. Now make the default 25 and
let people decide on how many they want to use.
Gibheer