(optional) This option will hide the given topic from users of the Lyris web interface. Mailing lists which are categorized under this topic will also be hidden.
The main purpose of a topic is to organize mailing lists. Thus, you would usually want a topic to be visible, so that your users can easily find their way around.
However, there are several circumstances where you might want to hide a topic:
* your new topic and mailing lists are not ready yet (you are still configuring them), so you don't want them to be visible
* your topic is private, not of general interest, or you only want people you tell to know about the mailing lists.
Mailing lists that are categorized under a hidden topic are also considered to be hidden. The "lists" command honors the hidden topic setting, and does not display mailing lists that are part of a
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