QGAL: remove the caching of simplified graph

After discussion with Jan-Arve, we decided to remove for good the
caching of simplified graph. This avoided recalculating the
simplification (but not the simplex) in some situations. Since vertex
simplification, this was temporarily disabled already.

To know whether if we could the cached version or not, we needed to
track individual anchors to see whether they reached size 0 or they
were 0 and changed the size. This is because the vertex simplification
depend on that fact.

Now the simplified version of the graph exists only during the
execution of calculateGraphs() function. This and next commits clear up
the code to take advantage of that fact.

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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