QGraphicsAnchorLayout: implement "deep" simplification

Re-start the simplification procedure every time there's a change it
the adjacent count of a vertex -- which happens when a new parallel
anchor is created.

The original algorithm stopped some simplifications too early,
demanding the simplex unnecessarily.

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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