TempUser CentralAuth integration

Add a hook "TempUserCreatedRedirect" which allows an extension to modify
the post-save redirect after a temporary user is created. CentralAuth
will handle this hook in order to redirect to loginwiki. Loginwiki will
redirect back to the page being saved.

In LoginHelper::showReturnToPage add an "anchor" parameter to specify
the URL fragment to redirect to. This is intended for section editing
with a redirect via loginwiki.

In AuthManager::autoCreateUser(), just allow any valid username, don't
require it to be creatable. Previously a non-creatable username was
allowed only with $source=AUTOCREATE_SOURCE_TEMP, but CentralAuth
depends on user autocreation from the session during refreshCookies. The
session is already validated at this point, so it's not like a user can
exploit this to create arbitrary names.

Change-Id: I623330dbf5d0573c93ae22f962618d6ddbd126d9

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