QGraphicsAnchorLayout: use a recursive approach for size hints

Bring back the refreshSizeHints() now that we have locally the
necessary information to get the size hints given an arbitrary anchor
data. We also created a bit to set whether the AnchorData is an anchor
of a layout (i.e. connects the layout with something else) or not.

This costs one pointer more in the AnchorData, but simplifies a good
deal of code and avoid traversing the graph to get this information
back, so I think it's worthwhile.

Signed-off-by: Caio Marcelo de Oliveira Filho <caio.oliveira@openbossa.org>
Reviewed-by: Artur Duque de Souza <artur.souza@openbossa.org>

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