QGAL: parallel anchors sometimes have to fix constraints

For an out-of-order parallel anchor, i.e. when the second child is
backwards in relation to the parallel anchor, we need to fix the
constraints that used to have the second child.

The parallel anchor will replace its child, but we must change the
multiplier signal, so the constraint remain valid.

This commit also changes the order of restoration steps, since now we
depend on correct vertex information to fix back the constraints, we do
it before the restoring of pair vertices.

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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