Remove signature on first post

Hides the signature of a user from the 1st post of every topic.

Requested by shadow in http://www.rmcgirr83.org

#
#-----[ OPEN ]------------------------------------------
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viewtopic.php
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#-----[ FIND ]------------------------------------------
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        $postrow = array(
            'POST_AUTHOR_FULL' 
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#-----[ BEFORE ADD ]------------------------------------------
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        $disable_fpsig = ($row['post_id'] != $topic_data['topic_first_post_id']) ? true : false; 
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#-----[ FIND ]------------------------------------------
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            'RANK_TITLE'        => $user_cache[$poster_id]['rank_title'], 
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#-----[ BEFORE ADD ]------------------------------------------
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            'DISABLE_FPSIG'     => $disable_fpsig, 
#
#-----[ OPEN ]------------------------------------------
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styles/prosilver/template/viewtopic_body.html
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#-----[ FIND ]------------------------------------------
#
    <!-- IF postrow.SIGNATURE -->
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#-----[ REPLACE WITH ]------------------------------------------
#
    <!-- IF postrow.SIGNATURE and postrow.DISABLE_FPSIG -->