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This also properly handles self-loops and thus fixes #180.

The new format fully supports all property map types present in
graph-tool and should be much faster and produce smaller files than the
other text-based formats.

This fixes #178.

This fixes #171

This replaces a custom implementation of Ullmann's code.

Now default constructed edge descriptors are impossible to occur in
regular graphs.

This switches the edge_descriptor type in adj_list<> from std::tuple to
a custom struct.

This also implements direct manipulation of OpenMP settings (schedule
and number of threads) via python.

Now, if either vertex or edge filtering is enabled, simultaneous
filtering is activated. By not considering vertex or edge filtering in
completely independent fashion, the compile time memory requirements
reduced to about 50%.