Add rcube_db::escapeSimple() method for backward compat.

Aleksander Machniak

2013-04-17 39a034b50d65dca9215059b0e001ec1de41d0406

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