ewiki_auth plugin hooks

The ewiki_auth() function lets the ["auth_perm"]0+ plugin decide about
access granting, if it finds one. It also calls the first ["auth_query"]
plugin before, and after the ["auth_perm"]0+ returned false (but then
forcing to print a login form).

The ["auth_userdb"] plugins are not called directly from within ewiki_auth(),
but they get activated by ewiki_auth_user() which itself is called by some
["auth_query"] plugins (but they do not need to do this, if they know a
better way).

But please read the following plugin hook explanations first, if you go to
write your own customized ewiki_auth plugins:

prev << "ewiki_auth plugin hooks"
next >> "$ewiki_plugins["auth_perm"][0] ($id, &$data, $action, $ring, $forcelogin)"

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You cannot modify the ProtectedMode file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the ProtectedMode.Discussion.