Add another alias for backwards compatibility

Thomas Bruederli

2012-05-23 b97f21a18f9ffa5306bdccbb77c4b63a09a0e4e7

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<?php
 
// Help content iframe source
// $rcmail_config['help_source'] = 'http://trac.roundcube.net/wiki';
$rcmail_config['help_source'] = '';