Fix various PHP code bugs found using static analysis (#1489086)

Aleksander Machniak

2013-05-06 187cf5e1cdee87fb1d26599f93202222bb7b8a4b

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