so that restrictedTraverse to published objects work for Anonymous.

Before this change, an unconfigured Web Section would match all
available documents, which can be surprising (security would still apply,
of course).

effective_date, when defined, prevents a document from being visible even
if it is in the correct workflow state.
Note that this is orthogonal with workflow states: a document which must
not be visible should not be in a workflow state which makes it visible to
begin with. effective_date only affects website-style document listing and
lookup.

As this means sorting had no effect, drop sorting on versions: versions
are arbitrary strings which can have any evolution scheme, so do not try
to guess what is more recent than something else.

because they are mostly used in non-web mode.

so that pages rendered as authenticated will never be displayed after logout.

<u> tag does not exist in the standard used by erp5_web; use something which
should be equivalent

Otherwise, user gets redirected to site root with a login error.

Also fix a regression in erp5_web, which was introduced when naming convention
test was reapplied.

so that we can change the skin selection in each Web Section.

-Titlecase terms, uppercase abbreviations, avoid jargons, add titles to empty title forms....

Add web alike getDescription (WIP)

raise NotImplementedError in WebSite_createWebSiteAccount so that it is not executed actually, because it is just an example of the implementation.

Revert 97d2dbbb (we do not need to generate all entries per feed request only the most recent once as client code is expected to keep a "local" copy instead).

Make sure Web Message events are properly reindexed after creation, before the fetch_incoming_web_message_list alarm is run

limit portal types in WebSite_view/listbox otherwise the web site itself can appear if there is an access rule script.