Products-collage

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* Added conditional include of CMFCore permisssions.zcml for Plone 4.1 support.
[thet, tom_gross]

* Added addional renderer, which respects effective and expiry-date.
[tom_gross]

* Restored Topic summary-view for Plone 3
[tom_gross]

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* Updated set of catch exceptions; location error exception is 2.10+
only. We fall back to attribute error. Also, narrow list to the
exceptions likely to be raised because of environment errors.
[malthe]

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* Catch name, type, value and location errors raised while rendering
content inside a composition, but display a warning (status
message).

This allows a user to change to an alternative layout in the case
that the system is broken.
[malthe]

* Changed alised topic views such that only the initial batch is shown
(without pagination). In addition, the headings in these views are
now clickable and lead to the referenced topic.

This makes topic views less busy in the general case where an
already existing topic is shown.

Note that topics created inside the composition retain their
existing behavior.
[malthe]

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* Fixed topic templates so that H2-headings are not marked with
'documentFirstHeading'.
[malthe]

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* Fixed topic templates so that headings used are ``H2``, not ``H1``.
[malthe]

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* Fixed a broken expression in the ``topic_album`` template.
[malthe]