Nosy list improvements. . added option to automatically add the authors and recipients of messages to the nosy lists with the options ADD_AUTHOR_TO_NOSY (default 'new') and ADD_RECIPIENTS_TO_NOSY (default 'new'). These settings emulate the current behaviour. Setting them to 'yes' will add the author/recipients to the nosy on messages that create issues and followup messages. . added missing documentation for a few of the config option values

<!-- $Id: msg.index,v 1.2 2001-07-29 04:07:37 richard Exp $-->
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    <property name="author">
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    <property name="summary">
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