[ewiki] Create action flag

I need my authentication code to know when it is trying to authenticate for
page creation, but there is a problem.  As it turns out, most page plugins
do not have any data in the database, thus an edit action on a page plugin
looks exactly the same as a page creation.  For the moment I am checking
$ewiki_plugins['page'] for the id but I'd rather if ewiki_page would add the
name or function name the plugin to be executed to $data['page_plugin'] so I
could check that instead.  Other options could work too, any
ideas/comments/glaring problems?

-Andy

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