lua.wetgenes.gamecake.fun.chatdown.chats.set_tag
tag_value = chats:set_tag(tag_name,tag_value,subject_name)
Alter the value of the given tag_name. If the value string begins with a "+" or a "-" Then the values will be treated as numbers and added or subtracted from the current value. This allows for simple incremental flag values.
Again if the tag name does not contain an explicit root then subject_name will be used as the default chat subject.