TWiki::Access $action  - 'VIEW', 'CHANGE', 'CREATE', etc.
$user    - User object
$text    - If undef or '': Read '$theWebName.$theTopicName' to check permissions
$meta    - If undef, but $text is defined, then metadata will be parsed from $text. If defined, then metadata embedded in $text will be ignored. Always ignored if $text is undefined. Settings in $meta override * Set settings in plain text.
$topic   - Topic name to check, e.g. 'SomeTopic' *undef to check web perms only)
$web     - Web, e.g. 'Know'