This gives each comment tag a "weight" value, which is a float. This
weight can be set for each user to affect their future comment tags, and
if a user doesn't have a weight set it uses a global default value
that's set in the INI file. This global default is set to 1.0 for
development purposes, since that should make it so that a single tag
will have an effect. It should probably be set lower initially in
production so that single users can't cause tag effects.