I'm not sure if this will work with your version of Typo3, but try setting the following options in typo3conf/localconf.phpor using the installation tool.
$TYPO3_CONF_VARS['SYS']['displayErrors'] = '0'; // or '-1' to see other errors
$TYPO3_CONF_VARS['SYS']['errorHandlerErrors'] = 22519; // E_ALL ^ E_DEPRECATED ^ E_NOTICE (everything except deprecated-msgs and notices)
$TYPO3_CONF_VARS['SYS']['syslogErrorReporting'] = 22519; // E_ALL ^ E_DEPRECATED ^ E_NOTICE (everything except deprecated-msgs and notices)
$TYPO3_CONF_VARS['SYS']['belogErrorReporting'] = 22519; // E_ALL ^ E_DEPRECATED ^ E_NOTICE (everything except deprecated-msgs and notices)
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