Widget view management refactoring.

hello,
Due to customer needing and some CPS remembering I create a branch based on 1.3
some monthes ago.
The goals were to create a *real* widget condition expression with full context
and move visibility mode into a tales expression too.
All is implemented and in production on complex documents (DatagridField,
CompoundField, ArrayField and AttachmentField) but it needs some attention: to
be able to switch between view, edit and search mode they have to present the
same macro API. This point breaks compatibility as I added a widget_body slot
in view mode. The others parts of the patch are optionnaly but for this one I
couln't find another solution.

Now I would complete the untitests and try to port this on next Archetypes major
release if nobody see a critical objection.

Regards,

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