QGAL: deal correctly with anchors in parallel with the layout

In the preferred size calculation, we should not add 'layout anchors'
(either one or the two halves) into the objective function, since the
layout doesn't impose or prefer any size at all.

This already worked for cases when the layout anchor is one, but not
when we have two halves. The mechanism was a 'skipInPreferred' flag
that were not being set.

The flag is pretty much redundant right now, since we can get this
information from the 'isLayoutAnchor' flag. So, the flag was removed
and a test was added for both a parallel case with the entire layout
and other with half of the layout (which wasn't passing before).

Signed-off-by: Caio Marcelo de Oliveira Filho <caio.oliveira@openbossa.org>
Reviewed-by: Eduardo M. Fleury <eduardo.fleury@openbossa.org>

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