QGAL: Do not create sizeHint constraints for dependent anchors

Some anchors have their sizes linked directly to the size of
others. That is the case for instance with center anchors where
one half must have exactly the same size as the other.

To make that more clear, adding "dependency" info to AnchorData
and setting it accordingly. This is future proof in the sense
that if someday we are allowed to anchor to other items in terms
of percentages, like, anchor to 70% of an items' width, we would
also need this notion.

Knowing that, we no longer need to create size hint constraints for
the slave anchors, only for the master ones. The size of slave anchors
is enforced by the dependency constraint (sizeSlave = X * sizeMaster).

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

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