Boolean PHP settings in .htaccess should be set with php_flag

In .htaccess, several PHP configuration settings are made with the php_value directive. Some of these settings are boolean values, and PHP documentation (http://us2.php.net/configuration.changes) says they should be set with the php_flag directive, not php_value:

Note: Don't use php_value to set boolean values. php_flag should be used instead.

I have not seen any problem using the php_value directive, but for best compatibility it seems advisable to follow PHP's documentation.

The attached patch changes "php_value ... 0" to "php_flag ... off" for the boolean settings: magic_quotes_gpc, register_globals, session.auto_start, and mbstring.encoding_translation.